I have noticed just a little bit of bubble algae, and a little hair algae. I don't have a severe problem, but I want critters in my tank that will keep the problem under control. I have been using a similar method for removing algae, only I use a toothbrush and hold the siphon over it. My params are good. Also, mithrax crabs are supposed to eat bubble algae, but I have one and mine never disapears from him or anything else, I have to remove it manually. Thanks for the info.