That looks like Derbesia from the photo. About as bad as Bryopsis. If left unchecked it will overgrow the aquarium.
You need algae eaters and lots of them. In the last photo I noticed an Astrea snail chomping away at the Derbesia. They do a great job but you need about 75-100 of them. Also good are the tangs, esp Zebrasoma and Naso, and of course my favorite, the Rabbitfish. Naso's get too big for that tank so stick to Yellows, Purples, Powder Browns, etc. Kole tangs prefer shorter filamentous algaes and will be less efective unless you constantly trim the algae to get it the right length for them. Lawnmower blennies have a bad habit of dying after they run out of their favorite algae. Rabbitfish also do a good job.
Another option for isolated algae occurances is to take the offending rock and throw it in the front yard. This seems to work pretty well, assuming theres nothing attached to the rock you like or can't frag first.
Of course you need to check Phosphate and Nitrate levels, both should be as close to zero as possible. (Nitrate <5ppm, Phosphate <0.2ppm.) You can also drip Kalk to raise pH and remove some Phosphates. Also make sure your KH is 12-15, and you have have strong flow from your recently cleaned power heads. This favors high pH and high ORP, algae likes neither.
I apologize in advance to any phycologists out there, but I say we kill this stuff...



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