hello, 55 gal. two clowns one blue tang and one gobie. Corals lots of live rock, doser for b-ionic, hang on back refugium, power heads. perfect water conditions, clear beautiful no nitrates. Fish are healthy, lots of hermit crabs, bristle worms etc. New bulbs after 8-9 months. Now lots and lots of ugly algae. I remove as much as possible, just grows and grows. Rocks and back of tank continue to grow this junk. Tank now looks terrible. HELP. Second, 20 gallon x-tra tall for a mantis shrimp. power filter just for water circulation, some live rock can this work without a skimmer ?? I thought it would, maybe just more water changes?? Thanks for any help, Blaine