:happyfish I had problems with bubble algae once, and got a bunch of emerald crabs for my 55 gal. reef, but they didn't really help a whole lot. Is what I did is I took out the grape algae infested rocks, and put them in a bucket, and scrubed it with a toothbrush where the grape algae was, and kept in same temp , and same adjusted saltwater, so as not to have die off of the live rock, and rinsed frequently, and it worked 100%. Not one single grape algae since. Very messy and time consuming though. Be carful not to break the big ones, they will release spores and seed your tank with hundreds of grape algae. I did numerous phosphate dips to keep them away too for the first month. NO problems since! If you don't want to do that, You can do phosphate dips, or get more emerald crabs. Good luck, and you are really doing good to have the algae, it's just the grape algae that are bad news, because they spread EVERYWHERE easily if poped, and become an eyesore if they take over a tank. Good luck, ali