Algae

[Marcus K]

I have been at battle for about a year now with algae and need some advice. My tank is a 90gal with 500watts of PC, 20lbs of live rock, CC bed about 1.5" deep. For filters I have a amiracle sump, Lifeguard UV,SWC beckett skimmer. I have just purchased a 6 stage RO/DI unit, was purchasing water from safeway culligan RO machine. I use IO salt and have just removed about 10lbs of Lava rock. For fish I have a Yellow Tang, Kole Tang, Maroon Clown, Five Green Chromis, and a Diadema Dotty, Cleaner shrimp, Toadstool, couple of Zoo frags, RBTA, Xenia, Lots of green hair algae and now some read slime. After removing the lava I added a pouch of allgone. Not sure what else to do, my refugium is getting taken over buy the red slime.

Am I doing anything wrong.

Marcus