Re: Sick Fish
The nitrates are probably the cause. You said the fish are choking and so is probably the filter. Even though nitrites are not a problem because your filter bacteria is obviously established, nitate is still a harmful substance and the best way to lower it is water changes.
40% every other day will do the trick.
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If you have a big enough tank with enough hiding places, pH of around 7, you can keep virtually any fish together as long as all the fish are around the same size and these two groups of fish are avioded:
Serrasalmus
Tetradon(figure eights and dwarfs are the
exception).
I keep a successful community of fish in a 4 foot tank including the following families:
Cichlids, tetras, loaches, gouramis, barbs, rainbows, livebearers, killiefish, catfish, puffers.
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