Algae ID with microscope pics

[beesnreefs]

Hoping someone can help me ID this stuff.

Sample of patches on a rock.

At 40x under microscope

At 100x under microscope

 

[vetteguy53081]

Looks like an algae called derbesia which is confused with bryopsis and needs to be pulled by hand but most important is to remove the roots. If the roots remain, it will keep coming back. A dental pick or small crochet needle will pull them well
Then reduce white lighting intensity or number of hours white light is on and add some large astrea snails, chiton snails and pitho crabs for control