Algae or something else on gsp

[megafauna1992]

What is this? How do I fix? The gsp has not fully opened since I got it a few weeks ago.

 

[Uncle99]

Looks like green hair algae winning over GSP.
Maybe some astrea?

 

[crazyfishmom]

I’m not sure if it’s GHA or bryopsis… seems like time for chemical intervention if you want to save the GSP.

 

[VinnyBoy]

I had algae grow like that on my GSP as well, thankfully GSP is almost impossible to kill. Take a toothbrush to it and gently scrub the algae off. It definitely feels wrong to do so but they’ll be fine lol. Mine opens up just fine the next day after I scrub them, a few polyps may stay closed a little bit longer than that.