too much light?

In my latest post I asked about the health of one of my acroporas as it seemed to have been bitten, it is complitely healed and in fact it si growing a new branch. The problem is with two of the acro frags that I recently moved to the final position after a few weeks on the center bottom of the...

is this stuff just hair algae or something i should be worried about

This is not a troll; I need some real experts to help me out. I have an absolute absence of Coraline algae in my not-new sps tank. I don't use 'mature' bc it's an sps frag tank...with zero coraline. I have a dark brown velvety algae on some rocks and some GHA in my AIO back...