Is it always a big growth on the edges of the fin or on the side of the fish?
I have some spots on some fish that seem like whitish nodules but they are only on the rays of the fins (not on the edges). They dont get big (maybe 1-2mm) but they havnet gone away. They seem to me to be under the skin not on top of it and you can tell if its on the front or back of the fin but still under the skin. I have not aggressively medicated for things becasue I dont really know what it is.
I was thinking about trying Parinox from this link since it was a broad treatment of things since I dont know exactly what it is. I have been reading lots of things to try and figure it out but im not an expert.
http://www.capitalcichlids.org/forums/showthread.php?t=4135