Sorry to be so dense, but I am beginning this battle too and need to know exactly how the squirting works. What kind of squirter do you use? Is this directly on a leaf that is temporarily out of the water (during a change)? Or in the vicinity of a leaf while still under water?
I can see using a squirt bottle filled with excel and holding each leaf above the water line during a change, but am not sure how underwater squirting would work if that is the answer. I do 25% water changes and some of my BBA is below that level. I'd do a bigger change if I had a bigger water aging tank, but I don't. This came on because of my more frequent water changes, which I need to do for the altums.
Damn you BBA!