[Bert H]

I agree with the above. Blackouts will NOT get rid of Cladophora. I second Cavan's advice. Manually remove as much as possible, and be constantly on the look out for it. I had a little a while ago, and constant vigil for removing along with a little OD'ing Excel (2x) for a couple of weeks took care of it.

 

[Bert H]

ok, wow. Thanks guys.
I see that I really do have to nuke it from orbit. I'll move the fish to another tank and begin orbital bombardment.

LOL! Keep us informed how it goes.