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Old 05-21-2012, 08:26 PM   #1
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Water change for platy fry

Hi all,

I've been wondering how many times I should change my fry tank? I've been doing 25% changes every day, but I think that many be harsh on some of them, since a few have been dying..
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Old 05-21-2012, 10:11 PM   #2
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The fry may be deformed or the less healthy ones. How big is the tank? If its small then why all the water changes? I change my fry tan water every week at least 40-50%
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Old 05-21-2012, 10:18 PM   #3
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I agree with Bubbles0oO. A 40 - 50% water change once a week id good enough, but if you want to be more cautious you could do that twice a week.. But i think a 25% water change everyday may be be bad on the water (maybe.. because of benificial bacteria) and on the fish. Just make sure your fry have plenty of hiding places and food that they can eat.
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Old 05-21-2012, 11:47 PM   #4
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Yes I agree with bubbles and smiley I do a 50% water change every week on my fry tank. And they are growing up healthy so far
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Old 05-22-2012, 12:14 AM   #5
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Water changes....

Quote:
Originally Posted by Ahdogs View Post
Hi all,

I've been wondering how many times I should change my fry tank? I've been doing 25% changes every day, but I think that many be harsh on some of them, since a few have been dying..
For what it's worth, if you are needing to change 40%-50% of your water every week, your filtering system may not be adequate.
As a hobbyist /breeder, I routinely changed only 10% of the water on a weekly basis and "vacummed" small areas of the gravel every 3-4 weeks in my display tanks.
I was trained by a certified Ichthyologist who told me that drastic changes in an aquarium are a recipe for disaster. "Fish need stabilty to stay healthy and grow." This water changing schedule produced thousands of fish and had my fish living for a high number of years.

As a commercial breeder, the water changes were still small for the fry but more often due to the uneaten food in the tanks. The breeders remained at 10% per week. This schedule produced millions of fish.

I know there are a number of you on here who subscribe to large water changes but I think you are doing more harm than good and opening yourselves up for major disasters. (IMO)

For the poster about the benificial bacteria, They are found in the gravel and adhearing to whatever surfaces they can find. They are not usually "floating" in the water so changing large volumes of water won't really effect them. HOWEVER, an example where it can hurt them: take a tank that has a high load of ammonia and the bacteria bed has now grown to consume it. Rapidly taking that food source away leaves the bacteria bed with more organisms than food so it shrinks by some of the bacteria dying off. This is not a good scenario. Yet another reason for smaller water changes.

Remember: Aquariums are an ecosystem. You don't have good results when you drastically change an ecosystem ( That's not just my opinion )
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Old 05-22-2012, 12:30 AM   #6
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Thanks to all the replies,
The tank that I'm keeping the fry in now is 2.5 gallons, but I don't plan on keeping them in there for a long time. I was planning on putting them in a 10 gal. When I do the water changes I use the tube for air stones and I clean up the uneaten food, that was the only reason I did it.

I only have a heater an an bubbler in the tank with a few plants, so I wanted to keep the tank clean...

Thanks everyone who replied, now no more dead fry! (hopefully)
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