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How long has the tank been setup for?
The algae I'm not sure about, but do those look like the scary kind of zoas to anybody else...? ;Nailbiting
If you look at the various images in the article linked below, I'm guessing the ones above look most like sample H or I in the article which are non- or weakly-toxic.
https://www.coralbiome.com/2011/11/21/palytoxine-danger-2/
I think you're right... Something about them caught my eye the wrong way I guess, when I first saw those pictures. lol
It looks like green wire algae. I had that in my tank for several months (at about the same age as your tank) and struggled to control it. When I also started seeing green bubble algae, I put a couple of emerald crabs in my tank because they're known to eat bubble algae. But as it turned out, the crabs didn't touch the bubble algae but they loved eating the green wire algae, and after several weeks it was completely gone! I still have small patches of bubble algae that the emerald crabs won't touch, but luckily it hasn't really spread.
I think you're right... Something about them caught my eye the wrong way I guess, when I first saw those pictures. lol

