OllieNZ
Member
I noticed this growth a while ago. It dosen't seem to be affecting the fish in any way, it is not getting bigger or smaller either. Any ideas what it may be?
I think Sanj is right and that it was Mycobacterium, my only venture into Rainbow fishes has been with Threadfin Rainbows, and I've always had 1 or 2 females die out of any batch I've bought, with very similar symptoms, in the first couple of months. After that the fish have been fine, haven't showed any further symptoms and have spawned etc.There is little point overley worrying about mycobacteria since it can come from many sources and seens entrenched in the aquarium trade anyway.