HELP! My fish has something visibly wrong with it!!

If your fish has numerous small white bumps all over it, it probably has Ich, or white spot disease. See http://www.petfish.net/kb/entry/12/163/
NOTE: In goldfish, small tubercles can form on the head and gill plates. Do not be alarmed, this simply means that it is ready to breed.

If your fish seems to have a grayish fuzz over him and is really lazy, specifically bettas, it probably has Velvet
See http://www.petfish.net/kb/entry/12/171/

If your fish is growing some sort of cottony substance out of any part of his body, it probably has Fungus.
http://www.notcatfish.com/health/fish_fungus.htm

If your fish has worms sticking out of it, it most likely has Anchor worms.
http://www.notcatfish.com/health/anchor_worm.htm

If your fish's fins are shrinking and the edges are turning white, red, or black, it most likely has Fin rot.
http://www.petfish.net/kb/entry/12/335/

If your fish's scales are sticking out and it's whole body is bloated, it probably has Dropsy.
http://www.petfish.net/kb/entry/12/159/

If you fish is swollen near it's anus, it is most likely Constipated. http://www.petfish.net/kb/entry/12/332/

For further diagnosis, see our Disease Articles Category http://www.petfish.net/kb/12/