The purple slim bubble algae started on one rock and is now moving to others. Anyone have any tips to control/ get rid of this problem. I have snails, hermits, a emerald crab and a cleaner shrimp. There is a decent amount of green algae too but the snails hermits and emerald seem to be eating that pretty well and I scrap daily. The only coral I have is GSP and xenia the rest of the tank is just live rock. Any and all info/ help is appreciated.