Sorry I don't know what is " hard green but also slimey on your rocks "
I just noticed you said did 60% wc with rodi water so thought best ask if was pure rodi or you added salt.
Your salinity at 1.2 you say.im unsure what 1.2 means also as for reef tanks my understanding is sg should be 1 023 - 1.027 and I keep at 1.025 so gives little wiggle room each way or 35 put = 1.026 I believe but never heard anyone say there salinity is 1.2 unless you mean 1.020 which is to low for corals imo.
Your cloudy water looks like a bacterial bloom as others have stated and bacteria blooms can strip oxygen out the water ,for this reason I have 3 powerheads in my tank and 2 are pointed upto the surface for surface agitation to promote gas exchange and skimmer runs 24/ 7.
Me personally I would never have my powrrheads reminding 2 hours on and 2 hours off,maybe your return nozzle facing surface idk .
And at night when lights are off anything photosynthetic that produces oxygen through the day,at night now uses oxygen and produces c02 so even more important imo at night to have surface agitation from powerheads incase my skimmer stops working or return pump so power heads will keep flow for corals so can get rid of the c02 from themselves and surface agitation etc so my powerheads are very important to me.
All I can say is green hard slimey stuff on rocks at a guess probably some kind of algae but could also be bacterial and your hair algae turning colour probably means it died then caused the bacterial bloom or other way around idk.just trying write this real fast before take little girl swimming in 5 minutes time.
Anyway wish you best of luck and hope you get to bottom of your problems and realise what caused it and hopefully prevent it from happenning again
