<a href=showthread.php?s=&postid=11583490#post11583490 target=_blank>Originally posted</a> by papagimp
sounds like ich, a slightly raised (but not always able to visually tell) white bumps. If they only have a few at the moment, hurry and get them into QT or preferably a hospital tank and start some form of ich treatment. depending on the species, either a hypo treatment or some type of chemical treatment. It'll only take a day or so and they could easily be completely covered head to toe. Read up on ich treatment and QT procedures, keeping in mind that trying to cut down time in QT for ich, or trying to rush the treatment process will only end badly. Need to do a full treatment, and leave the display tank fallow (nofish) for at least 4 weeks, minimum. I'd recommend closer to 6-8 weeks to play it safe. If they were any other fish in the display tank with the infected fish, consider those infected as well and treat everyone. Most ich treatments are severely hazardous to inverts so no treating the diplsay tank directly or you'll risk killing alot of the benefical stuff as well as plenty of invert livestock.
fwiw, I rarely QT anything but recently purchased a couple small citron gobies, for kicks I stuck them in a small 2.5g nano for "qt" and found them covered in ich a few days later....came that close to infected a fully stocked dual 75g system.