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Any ideas on this cyst that is on the ray of the fins. This is an old pic but you can see the one cyst on the side fin...theres more now. The female started out with them...then the male. I also see it on my oscars that are in another tank. It seems to have slowly spread. On my oscars I treated with aquri sol (copper sulfate) for like a week with no results. I have no idea what it is. Its only on the rays of the fins not the edges or the membrane. It seems to have started on the side fins on all the fish...but on my female I can see some on the tail fin and dorsal. Same thing...only the rays. I plan to med the oscars to see what might work if I can get a idea of what it is. I know lymphocytes is cyst on the fins but to me that seems its on the edges of the fins and not just on the rays. The cyst are 1-2mm. Water is good. They eat and act normal.