Raising Cichlid fry in hi-tech tank? - The Planted Tank Forum
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post #1 of 2 (permalink) Old 09-25-2017, 08:34 PM Thread Starter
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Raising Cichlid fry in hi-tech tank?

To get my keyholes to breed and parent, I had to use CO2 to fix the pH at slightly acidic.

The fry are into their second week and are eating/growing amazingly. Parents are doing a great job too in this heavily planted, dirted tank. All the little souls are still accounted for.

I test Nitrates frequently and the plants are using more than can be generated by waste. I have to still add EI ferts in small doses to keep the plants happy.

So here is the question: Is it alright to raise the fry in this setup without frequent water changes?

The reason to change water is to prevent build up of Nitrates, but the plants are consuming all the nitrates at a rapid pace.

If I do a large 50% WC, that will introduce a large swing in pH, so instead i've reduced EI and doing smaller WCs.
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post #2 of 2 (permalink) Old 09-25-2017, 11:21 PM
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The reason for the 50% changes may help lead you on what to do. We want to avoid a great big buildup of ferts and we are adding what we expect to be more than used when we do EI. So the extra big water changes will tend to knock down any fert build up. But that doesn't mean it is the only way. If you are monitoring and see the nitrate running out, you could add more or possible do it more often. Also the water change doesn't have to be on a strict 50% as two 25% gets the same thing done. Just watch for too much of something is the main idea. The EI is more of a "blind" trust idea to get plenty and then drain off plenty but it is an estimate and estimates are often changed.
Tanks change so at some point, you will likely be feeding more if all those fry grow. At that point the question may change and you have too much nitrate from too much waste.
Watch, learn and adapt as needed?
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