You seem to be going in the right direction. And I see now the how the DI is hooked up and makes more sense. You are right the top clear tubes are the DI. I would keep up the manual removal of gha. As for fuge light, time will tell, as long as mangroves and cheato are doing well I would stick with the LED but if not I would switch back. Battling gha can be a long battle, just hang in there.