Nitrite

jaydubva said:

what is exactly is nitrite

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The univalent radical NO2 is exactly what it is.

jaydubva said:

and how can i get a control of it. i had my water tested after my catshark and dwarf frog died and was told that it was high so i do partial water changes everyday and it is still at .5 ppg

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How big of partial water changes are you making?

Hmm. Assuming some displacement for substrate and decorations, 3 gallons is pretty significant, not quite 50%, but approaching it at least. Tell me about your feeding schedule?

Thats a bit much, do it once a day i say.

jaydubva said:

half teaspoon of freeze dried blood worms 3 times a day

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Well, that could certainly lead to som of the pollution. A half teaspoon is a staggering amount to me. I don't feed a half teaspoon of flakes per day, much less three times per day and I have many more fish than you do. Try and cut that back to two tiny pinches of food morning and night and I think with some major water changes, somewhere along the 50% range a few days in a row and you should see that come down significantly. You should also look into some variety in their diets. The betta can live on three tiny little betta pellets a day, for instance. I mean, these things ar less than a millimeter in diameter. Actually, I have a betta and three ghost shrimp all living on that amount right now.

How old is the tank?