Are you refering to the garra ruffa known as doctor fish, my lfs (watermarque)has loads, quite tempted myself to get some, they are like loaches/sucker fish very entertaining :rolleyes:
I would say it was the Angles or the Fighting fish, Angles are fin nippers and the fighters are ok if kept on their own but will go for other fancy fish such as male guppies as they see them as rivals for a fight! :)
Hope this helps
ive just treated my 3wk old tank for what i thought was white spot now i am not so sure it is. My swordtail has a large white patch at the start of his tail and my silver molly has a white cloud over his eye and tiny white patches on his tail, Does anyone have any clue to my problem?