I have a 210 gallon fish only tank that I am having a tough time getting my algae under control. I do regular water changes and feed sparingly. Yet when checking phoshates with a Hanna checker, my readings are less than .03 I dose lanthanum chloride to control phosphates thinking that this would get rid of the brown and red algae. I have a good quality skimmer, sump and good flow in my tank. Any ideas why I still have red and brown algae? Fish are doing fine, the tank just looks terrible. Thanks for your help
