My fishy has a weird condition. Have you seen anything like this?
The subject is a pink gourami. He's about 8" long and seems healthy. About 3 months ago, he and his cohabitants were thrown in a bucket so their tank could be moved, and shortly after being in their new location, a flat black spot was noticed on his forehead. The spot was about 1.5mm (yes, I like mixing metric and English units!). We figured he'd get over it. He probably got spiked in the face from being in a small tub with some other fish we thought. In fact, another fish had a similar-looking black spot on her body for a bit, but it went away.
But no. About a month ago the gourami's spot turned green and erupted. There is this little puff of green fuzz sticking out. He doesn't appear to care. No rubbing or flashing or odd behavior.
I can't convince my spouse to hold the fish while I pull it out with some tweezers, so I can't get a sample of it. The other fish are still unaffected. Actually, the fish with the thing on his head doesn't seem to be affected either, except cosmetically.
Any ideas what this could be? A parasite? Acne?