Planted Tank Obsessed
Join Date: Dec 2012
Location: In an aquarium nearby
If nitrates are not a problem... I just talked to one of my buddies who's starting an Iwagumi style and got BGA all over the place. He told me it dealt with BGA in a couple of hours by squirting locally, with a syringe, PPS-Pro.
You might try that if you haven't dosed the antibiotics yet. I think any NO3 solution should do the trick.