I found that the CO2 was the main key. When I finally got it to 30+ppm, the BBA stopped spreading. Then all I had to do was kill what was already there.
I got 10 young SAEs which helped. I also treated with Excel which helped. And on the one plant that nothing seemed to work on — Crypt lucens — I removed all leaves that appeared to have even a tiny speck of BBA on it. Most plants ended up with 1 or maybe 2 leaves while some had no leaves at the end. Then I planted it back in the tank. So far, so good.
One thing I did notice about the BBA on that plant is that the new leaves did not have BBA even though it wouldn't seem to go away or die on the older leaves. That's a real test of how BBA responds to CO2. Nothing stopped it from spreading until I got the CO2 level high enough.
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