Try siphoning all the red slime out then off your lights for a week, see if there is any improvement. I tried it before the red slime subsided for awhile before resurfaced again. Maybe should off lights for longer periods.
I dunno if I'm doing the right thing but I juz added my last remaining dose of ultralife RSR. Still monitoring the progress. If your chaeto is not growing or growing at a slower pace, most likely is the light not strong enough. U can also try switching off your fuge light for a week to try see if there's improvement.
I think this piece is called Monitipora Hodgsoni, that's the closest match I can find on the net,
Experts out there correct me if I'm wrong, thks.
After two hours, not much difference actually,