#2 KendraMc User Aquariums what makes you think a fish is sick? the ripped fin and faded colors? my guess would be more stress and bad fish count/combination. tiger barbs are aggressive and will nip at each other and other fish. i had one eat the entire tail off of another. i would recommend either getting a lot more ( i now have a total of nine with no further issues) or getting rid of them. colo