Alan Silver wrote:

Hello,

One of our fish has developed a white lump on a fin. It doesn't seem to
bother the fish, but I would like to know what it is and if I should do
anything about it.

Please have a look at :-

http://fish.alansilver.co.uk/Mark3/G.../040816BigBob/

and let me know what you think. TIA



Hard to tell - it could be a parasite or a fungus....have you taken him out and
given him a salt dip to see if whatever it is falls off. I would, but before
hand get
him out the water and inspect it first!