To me, his looks like bubble algae and hair algae of some sort. To me also looks some what like bryopsis, both turned up while I was on vacation. Tanks been up for 6 months and haven’t added anything since RAP.
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What is MA?
Not too many of us keep muriatic acid at home. Use undiluted hydrogen peroxide. For those algae’s, after removing by hand or syphon, then use tooth brush soaked in H2O2 and scrub the offending surface. Repeatedly resoak tooth brush in peroxide and brush off algae as H2O2 oxidizes everything it touches. If possible, remove rock and soak in 10% solution of peroxide and tank water for 10 minutes.
If you want to try a biological way there are some possible grazers for these algae.
Mixtrax crabs are often good grazers for Valonia algae(bubble algae).
I've also seen good results with rabbitfish.
Sea urchins like Diadema, Tripneustes and Mespilia graze all kinds of algae. One or some of those might be worth a try.
Good luck
/ David


Crabs are great but just think about it that one BA has a few hundred spores in them and that crab is breaking it open......
Foxface are the best but not for every tank due to size or already have other fish in there that won’t play nice together.
Yes I had a magnificent he was a model grazer in one of the fragtanks where I had more BA than frags one time![]()


