What's the white lump on Big Bob's fin ?

Alternately you can try swabbing the affected area with some hydrogen
peroxide and see if it goes away. If you can, a wet towel helps reduce
stress. Be quick. Don't leave the fish out of water for more than 30
or 40 seconds. Less harsh for the fish than a salt dip.

Lilly

Geezer From The Freezer wrote in message news:
Use the tank water....in a tub or CLEAN bucket....if its a parasite just
get some tweezers and gently pull it off.
Salt dip solution....you could try 10 tablespoons per gallon for about 3%
solution
and just dip for as long as your fish is not stressed too much (he will stress a
bit)
Others here may have different suggestions.