Guppy's Tail Turned Black and is Drooping

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Fishy_Business

Aquarium Advice Newbie
Joined
Jan 16, 2019
Messages
4
Hi there,

I've got a little runt of a guppy, Pascal, who has had a droopy tail and is "wiggling" to swim. He has never eaten much, but really hasn't been eating the last couple of days. We've had him for about 6 months.

Tank is about 3 months old and has had regular 25% water changes every 2-3 weeks. 5.5 gallons, all levels (ammonia, pH, nitrates, nitrites are all solid according to the test strips and according to PetsMart testing) and temperature is right around 78-80 degrees.

We started out with 3 male Fancy Guppies and lost one last week without any sign of anything being wrong, so we bought two neon tetras and an algae eater, to keep the remaining two guppies company, and added them to the tank 4-5 days ago. Two days later, Pascal's tail started drooping. I thought it may have been a live plant we added, so we have since taken that out, but the next day, the back half of him turned almost solid black - which I have never seen before. Today his color is back, but his tail is still drooping, he is still wiggling to swim, and it seems he is gulping a bit. I've put him in quarantine in a small, 1 gallon tank along with some melafix.

Any thoughts as to what it may be?

*Photos and Videos on their way*
 
Photos and Video

The first image shows normal Pascal colors.

The second one is when his tail turned almost completely black and the drooping significantly increased.

Third and fourth images are him in the quarantine tank, back to his normal colors and relatively straight tail again.
 

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Video

I'm not sure how to add videos yet, but have some to post if anyone can direct me on how to do that
 
Color of a fish is usually a reflection of it's health.

Usually when they turn black they are affected by a flagellate infection of the stomach such as hexamita.

25% water changes every 2-3 weeks isn't enough in my opinion. I'd shoot for 40-50% water changes weekly.
 
What would be the best option to treat hexamita?

I noticed this morning that his poop was striped black and white. Not sure if that gives more insight or not?
 

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I have the same problem in my tank I lost many guppies last month,
I can't find anyone to help

Did you find any any thing to help? please
 
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