Haven't gone the macro algae route, I only have a back chamber as my "sump" Haven't tried the fritz algae gone either. I've used Brightwell Razor and Macrobac to fight off bubble algae (which worked). I don't see a Fritz algae gone for Saltwater though....For now, try Fritz Algae gone. Water change 30% ever week. You should have a skimmer running. Lights off for 4 days, and cover your tank with something so no lights in. You also want to throw in some macro algae to try to complete with what is going on in your sump if you have it once 4 days gone.