@limz_777, are you going to test this out? I would be interested to find out too.
My hypothesis is that when a tuff of BBA is introduced (via driftwood or plant) into an optimally balanced tank, it will not kill off the BBA. This is because there will also be organic wastes in the tank regardless of how optimal it will be. The organic wastes should be able provide nutrients to the introduced BBA for it to sustain. While it may not propagate but I think it is tough enough to survive. For my own fight, the killing blow to existing BBA in my tank is the dosing of excel. Changing of water, proper fertilization, CO2 etc are just means to keep the plants healthy and to keep the organic wastes to a minimal so as to prevent an outbreak of BBA.
A potential way to try this out is to set up as follows:
a. 2 jars/tanks with distilled water each with a tuff of BBA. Put 1 in a lighted place and another in a pitch black place.
b. 2 jars/tanks with tap water each with a tuff of BBA. Put 1 in a lighted place and another in a pitch black place.
c. 2 jars/tanks with your aquarium water each with a tuff of BBA. Put 1 in a lighted place and another in a pitch black place.
Unfortunately, I don't think I have the commitment to go through with this test!
🙂)