I use Ro/DI, instant ocean salt. The tank is 4 months old. skimmer is producing a nice dry skimmate @ 1 cup every 3-4 days, the liquid is dark green and smells terrible. I do water changes every 2 weeks @ 5-10 %. The algae is not the classic diatom algae, i've been thru that. Nor is it cyanobacteria, been thru that also. This algae is more like a tussock of grass. It sort of looks like mini pom-poms. I see shrimp eating at it all the time but they are slowly being overwhelmed. Bubble probably hitched a ride on a recent addition, but it is spreading. How do I get rid of it? The fish are fed spray dried plankton and ocean primes prime reef. Cyclopeeze is also used alternately. Fish load is -I think light- 1yellow tang, 1 small clown fish, 1 fire damsel, 1 algae blenny. 2 fire shrimp. 5 or six grass/feeder shrimp very small.