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what is this stuff in picture starting to grow alot is it good or should it go

I have a 29 gal bio cube.Just added a aqua fudge refugium to back of tank (2.5) gal. I have reef set up with alot of live rock.I have two clowns ,fire fish and royal gamma. I run reverse light at night. Kh is 214 ppm calcium is 480 nitrates,amonia,phosphates 0 My question is my ph at end of...

starting to see alot of these.I know its not aiptasia but is it good or a weed.will it take over tank or do I need to kill brown starlike thing in center of picture