Step by step how to kill Planaria and Hydra!

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phoenixkiller

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Just putting this out there for those who want to try this. Want pics? I'll do what I can.

Anyway, to give you some background, my 10 gallon shrimp tank (That I'm about to tear down) was INFESTED with Planaria. As a first time shrimp keeper, I was really discouraged.

Being the irresponsible teenager that I am, I didn't do anything about it.

The problem got worse.

And worse.

And can you believe it? It got to the point that WCs would not make a dent in their population.

And then, about two weeks ago, I noticed three Hydra creatures in the shadow of my filter intake sponge. I did have the knowledge that this had to stop. Now. I knew that Hydra have the capability and the hunger to kill baby shrimp and fish. So, I did what anyone would have done in this situation.

I panicked.

Wait, what did you say? That's not what you're supposed to do? Oh well, what planet are you from? And quit looking at me like I'm an alien from outer space! lol.

Anyway, I frantically searched for something... something... that could kill these critters.

I looked on PlanetInverts's site, and read their article on killing planaria and hydra alike with a dog dewormer, usually found as Panacur-C. All other info on the web regarding dosing this dog dewormer was rare at best.

I read the article over and over, and read up on Hydra and Planaria.

To those newbies who don't know, I'll give you a definition of Planaria and Hydra.

Planaria:
Small worm creatures with a spade shaped head, very flat, rarely exceeding 3/4 of an inch. They are milky-white in color, and are the #1 pest of the shrimpers world, tied only with Hydra for their position. They are harmless, which is why I felt no immediate danger. They are usually caused by dirty substrate and overfeeding, a common trait of new shrimp keepers.

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Couple different pictures of the critters.


Hydra:

Small, 1/4" white creatures, related to the popular saltwater creatures known as corals. They look like a coral, only in miniscule size. Like corals, they have a biting sting to small things, capable of killing and eating baby shrimp and fish fry. This is why I panicked, I knew that my shrimplets were in mortal danger. DO NOT confuse this creature for the Detritus worm!
57106-albums10668-picture45331.jpg

This is a hydra, I didn't see mine with the little offshooting part though. It was just the big part.

57106-albums10668-picture45330.jpg

Another hydra, this one is just a littl bigger than mine were, but looked exactly like them. They actually look kinda cool, but heck, I hate 'em, as do most.


Now I looked over the part about people dosing the Fenbendazole (Panacur-C was what it was sold under). Many methods were used, but this is what I did. By no means is this the only way to do it, but heck, it worked for me.

I bought the package of it off eBay that specified it contained three 1-gram packets (I should add that Fenbendazole can also be found at Petsmart).


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The article said I had to dose 0.1 grams per 10 gallons, this is the minimum dose, the only dose safe for shrimp (Or so I assumed). I knew my gram scale used for measuring dry plant ferts could not register such a small amount of powder, so I ad libbed it. Not necessarily smart, but where would we be without experimenters? I filled a clean empty water bottle (I used this water bottle for priming filters, so it had only seen tank water. Hence, its cleanliness)


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with 200 mL of distilled water (I do not know if you need distilled or not, but that's just what I used). I then poured a full 1 gram packet into the water, and shook it for some time!

Since the recommended dose was 0.1 gram per 10 gallons, I put in 20 mL of water which, if I shook it well enough, should contain about 0.1 grams of the Fenbendazole. I measured out approximately 20 mL of the milky white solution with a medicine syringe thingy,


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and squirted the solution directly on all the visible Hydra and Planaria. After I squirted the visible ones. I stuck the syringe into the gravel (Which is where the planaria live and breed) and squirted a few mL per about say 6 square inches. The gravel became laced with the solution, and I squirted until I had completed the dose.

Unfortunately I did not see instant results, as my patience is about nil. So I felt like I panicked, bought, researched, and worked for nothing. So I sullenly went to bed.

When the lights came on the next morning (The lights work on a timer), I peered into the tank, fully expecting to see everything still alive (Planaria and Hydra).

I was pleasantly surprised.

The planaria, which had been so numerous that I would see dozens at a time, were gone, and the Hydra were reduced to shriveled stumps. The next day, the hydra were completely gone, and I inwardly rejoiced.

So here I am, a week later, and I have yet to see any more pests in the tank.
I think that there may be a few stragglers, so I'm gonna dose a few more times, but I don't think it'll be a problem again.

So, you spend like $10.00-$15.00 and kill a devastating pest infestation.

To break it down into steps for you, here's what you do:

1. Positively identify hydra and/or planaria in the tank. Their numbers matter not.

2. Go to eBay, find the cheapest option for Panacur-C, the package containing three 1-gram packets of the Fenbendazole. Buy it.

3. When it arrives, rinse an empty water bottle (Or other tightly sealing device) with dechlorinated or distilled water, and then fill it with 200 mL of either RO/distilled or dechlorinated tap water.

4. Tear open the packet, and pour the contents not into the water, but into a baggie. Using a rolling pin or some other broad, heavy object, crush the Fenbendazole granules into a POWDER.

5. Pour the powderized Fenbendazole into the water you prepared in the water bottle.

6. This step is one of the most important of all. Shake the Fenbendazole in the water until your arms hurt. There may not be total dissolvation, but do your best!!!

7. Measure out 20 mL per 10 gallons of tank water. Squirt at all visible Planaria/Hydra, then inject the remaining amount of the dose into the substrate. I don't think squirting it into the substrate is required, but it made me feel good.

8. Go to bed.

9. Even if the pests are all dead, dose again every 24 hours for a few more days.

10. Enjoy pest free tanks!

I am by no means an expert, but I thought I would just post my success with killing these pests.

Prevention tips are:

1. Feed sparingly. This is the number one cause for infestations. Uneaten food is food for pests like Planaria and Hydra.

2. Clean your tank thoroughly. A gravel vacuum should be thoroughly used, don't forget it!

3. Do your homework on these pests! Don't only look back at this thread, this has no where near all the info. Read up on these guys, this will definitely help you prevent these pests if you are serious about keeping them away.

4. DON'T BE CARELESS! I was careless, and I payed for it. Keep and eye out for pests, and be quick to fix the issue.

So post about this! Comment, subscribe, criticize, or just plain comment, and recommend edits or changes. I will indeed change it to make it better.

Thanks for reading, have a great night!!


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Last edited:
For mine, I used liquid goat dewormer, for Planaria. I understand it will be more readily mixed into the solution and the powder sometimes doesn't dissolve/equally disperse. (probably because people don't shake it enough)

Obtained from farm supply store, Fenbendozole.

Mine all died with one dose. Same dosage as OP. As long as it works!
 
Autumnsky said:
For mine, I used liquid goat dewormer, for Planaria. I understand it will be more readily mixed into the solution and the powder sometimes doesn't dissolve/equally disperse. (probably because people don't shake it enough)

Obtained from farm supply store, Safe-guard Fenbendazole.

Mine all died with one dose. Same dosage as OP. As long as it works!

Whatever works. I just went with the Panacur C, so I didn't give my opinion on it. I'm sure it works, but since I haven't used it, I don't want to lead others astray.
 
Ha..ha .. Good job pheonixkiller on taking proper steps after the obligatory panic attack. Two weeks ago I discovered what must be copepods .. Based on size and how they swim ... And nematodes. Hitched a ride on a new Anubias I thought I dipped, but forgot to.

I did the initial panic, but a quick read on planet inverts assuaged my fears. I do net the nematodes when I can as I just don't like the look of them swimming in the water. If they'd just crawl along the DW I'd probably leave them alone. During PWC's I manage to suck a few more here and there ... No signs of hydra thankfully.
 
While is this one way to get rid of them, there are other (less effective but still helpful) ways. Feeding less (dramatically if possible) and cleaning the substrate more often are two good examples.
 
I find this all wonderful information, great job!
I would also like to point a little note that often times people believe what they are infested with is Planaria but often times its not, most of the time its a Detritus Worm infestation instead. Planaria is not as common as the Detritus because the Detritus feeds off of decomposing matter whereas the Planaria can be carnivorous and feed off of eggs etc.
Add pictures and I believe it would be a wonderful article!
 
While is this one way to get rid of them, there are other (less effective but still helpful) ways. Feeding less (dramatically if possible) and cleaning the substrate more often are two good examples.
The purpose of the thread is not saying how to prevent the Planaria and Hydra (Though I should have included it), rather, to kill the existing population.
 
I find this all wonderful information, great job!
I would also like to point a little note that often times people believe what they are infested with is Planaria but often times its not, most of the time its a Detritus Worm infestation instead. Planaria is not as common as the Detritus because the Detritus feeds off of decomposing matter whereas the Planaria can be carnivorous and feed off of eggs etc.
Add pictures and I believe it would be a wonderful article!
I made sure that I described the Planaria Worm, I will get some pictures up to help further identify the "worm" in the fish tank a Planaria or a Detritus worm.

Thanks for your opinion, it is greatly appreciated!
 
phoenixkiller said:
The purpose of the thread is not saying how to prevent the Planaria and Hydra (Though I should have included it), rather, to kill the existing population.

My point was, if you limit their food sources by a lot, it can help kill them.
 
maxwellag said:
My point was, if you limit their food sources by a lot, it can help kill them.

This I have to disagree with, decomposing matter is not their main food source. Cutting back on the feeding schedule may help reduce the chance of a reoccurring infestation but it won't kill them. They are considered to be carnivorous and will find another food source such as eggs etc. when one source is not available.
 
This I have to disagree with, decomposing matter is not their main food source. Cutting back on the feeding schedule may help reduce the chance of a reoccurring infestation but it won't kill them. They are considered to be carnivorous and will find another food source such as eggs etc. when one source is not available.

I never said that decomposing matter was their main food source. It's one their food sources, and if you take it away, it can help get rid of them. IMO the most effective way to get rid of them is to do all three things together. You can kill them with medicine, but that doesn't mean they won't come back, which is why it is important to try to eliminate the cause of the problem.
 
maxwellag said:
Feeding less (dramatically if possible)

But by this statement you indicated that fish food could be the main source of their diet.
Planaria are carnivorous creatures and eat invertebrates (living or dead) and decaying organic matter.
So if we eliminate the major food source as you say then you would need to take all living inhabitants out of the tank for example in this case, the shrimp.

Cutting back on feeding fish and water changes is an effective way to reduce a Detritus Worm infestation not Planaria. Although you can suck up the Planaria with water changes it is possible that one can be cut in half then you have two worms instead of one and so on. Some planarians exhibit the ability to regenerate lost body parts.
 
The only surefire way to eradicate planaria that I've seen is a complete sterilization or the treatment outlined in this thread. Sometimes it takes a second treatment but it's extremely effective in general.
 
Great job phoenix (y)

I agree with the above, that this is one of the best ways to completely take out planaria. Cutting back feeding doesn't always work, this is a much more successful way to go about beating the issue.
 
But by this statement you indicated that fish food could be the main source of their diet.
Planaria are carnivorous creatures and eat invertebrates (living or dead) and decaying organic matter.
So if we eliminate the major food source as you say then you would need to take all living inhabitants out of the tank for example in this case, the shrimp.

Cutting back on feeding fish and water changes is an effective way to reduce a Detritus Worm infestation not Planaria. Although you can suck up the Planaria with water changes it is possible that one can be cut in half then you have two worms instead of one and so on. Some planarians exhibit the ability to regenerate lost body parts.

No, I said that eliminating or diminishing some of their food sources may help. The larger the population of planaria, the more food they need to survive. I never said eliminating just one would automatically make them disappear, or that one is their main source. i said that doing this can help kill them, but I never said it wouldn't be 100% effective.
 
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