04-17-2008, 04:56 AM
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Once the bio-bed is established in the filter and the gravel the biological system takes care of any ammonia before it harms the fish. Water changes and daily testing are indeed needed but water changes must not be to the point in which ammonia is kept at 0 (and eventually it will build up anyways from fish poo and leftover food or you will be doing 100% water changes). Until the bio-bed is established, cycling must be allowed to run it's course or all you end up with is a prolonged cycle. If your ammonia gets above .25 ppm, do a water change immediately but otherwise 25% every other day or so is probably good. 3 Danios don't make that much of a mess.
A quick google brings up multiple pages stating that danios are comfortable in temps from 68-78, anything higher they can live in for sure but they aren't as comfortable as they can be. (huh, the fish profiles on here states up to 84 but it's not really true)