Well you could try to only use ambient light in the
DT for a few days. If you did that, I'd do a water change (limit nutrients) and prune the macro (encourages growth) first. Then I'd plan on doing a water change afterwards using a small diameter tube as a siphon to get as much out as possible.
You might also want to get some caulerpa. I think it grows faster than cheato and might out-compete the BA for nutrients.
Of course, what do I know, every time I think I've beaten the HA in my 54 it comes back.
