I have a 125 gallon freshwater tank, running a Filstar XP3 filter, Co2 system, I have a lot of live plants in the tank and most of them seem to have brown algae growing on the leaves, i can wipe it off easily but it is truly a pain and looks terrible. Is there anyway I can get rid of this, or something that is causing this that i can do? I do water changes once a week, all parameters are good.