Did you have the same kind (red banded) aswel? because these were active too when i got them, now are hiding and dont spend alot of time eating either, one actually looks like it is quite skinny, man this is stressful, i got some filter medium to help with the building of good bacteria to combat the nitrite, our aqua clear 70 only has ammonia granules, carbon and a sponge at the bottom, petstore said that could b the prob with the nitrite.