I have a well established tank .. and one of my community fish has a lump that is extremely prevelant. The lump is protruding from the right side of his dorsal fin .. i'm not sure what to do exactly -- it appeared about 3 days ago -- and grew larger in the last day -- god forbid it pop and cause him to be exposed to some normally not dangerous element in the tank -- just not quite sure what to do. Anyone have any advice in this matter? I have a pic of it -- but couldn't import the pic to this forum .. anyone ??? It's about as tall and wide as an eraser tip -- a little bit smaller .. he doesn't seem affected -- has a wonderful appetite still .. and doesn't seem agitated at all .. Any input would be appreciated 
