HELP ID PLEASE

[Islandvib3s]

I think it might be golden star colonial tunicates(filter feeders) invasive? Should I try to remove them? I have been struggling with low to undetectable nitrates and tried feeding heavy. Its growing mostly in dark spots,under overhangs.

 

[ISpeakForTheSeas]

It's a bit hard to tell, but I don't think these are tunicates. Do each of those little guys have 6 tentacles around their mouth? I can only see one really clearly, but it does.