zoanthid health

I put this frag in and it was open and seemed good for 5 weeks, then it closed maybe annoyed by hair algae but mostly I've been able to get rid of the algae, but they still have not reopened for 5 weeks now. Can anyone see anything in my photo that might cause them to close, water parameters...

As a new reefer I experienced my first EXTREME algae bloom I mean green water "what are you doing in my swamp" kinda green. I got that all under control.. I'd say a two-three week battle. I did do about a week with *little* light as I have two corals.. star polyps(totally fine. Pretty sure he...