It has now taken over 2 rocks! My peppermint shrimp and cleaner shrimp constantly work on it but do not seem to be making any progress!! What else can I do???
I had some pretty good size ones in my tank and what I did was injected them right in the center with boiling water, you have to stick em good, one time each is all it took to kill them.
Good luck, let us know how it goes
Did you take the rocks out of the tank or do it right in the tank? I had thought about buying 10 peppermint shrimp to see if they would take care of it