i have 36 in a 100 so far no death. i would have to say the water wasnt cycled enough for the live bacterias. also 22 in a 12 thats a bit tioo much stress on the fish. also the filteration was not enough for the 12gallon imo. i think you should listen to ADE and take his advice. he had datnoids for a while. i would have to say one of the datnoid veterans here on mfk. xD. GL with the problem hope things clear up. and no more lost.