The day after I dosed my tank 90% of the BGA was gone. The following day it was 100% gone. Didn't keep it from coming back though! Still trying to figure that out... Tried increasing KNO3 and added a 300GPH powerhead to my 55G.
My only complaints is that it's somewhat expensive for what you get. It was like $15.00 and came in such a small bottle, maybe enough to treat my 55G 2-3 times.
yes awesome stuff although sometimes it can take several days and a second dose to kill all the BGA but it will kill it all. i save it as a last resort to nuke the stuff when all else fails. has never NOT worked. safe for fish, shrimp and plants as well.