110 Gallon reef aquarium Protein skimmer in 40 gallon refugium/sump Changing 25% once a month Tank set up since March 09 3 clowns,3 chromies,1 anthias, 1 yellow tank, 1 sailfin,1 mandarin goby, 1 cardinal,1 bleeny, 1 fire shrimp, 1 cleaner shrimp, snails, crabs I've started noticing a lot of red algae forming on the rocks and glass. I've taken some out and it just comes back again, it killed my bubble corals. I got chemiclean to remove it. It tells me to turn off skimmer and carbon filter. Do I also have to turn off the water flow from and to the sum? Is this remover safe to use? Thanks!!