ok i`ve been noticing that my tank has been growing alot of brown algea i started changing a higher dose of the water cause i was reading it was from high amount of nitrates but it seems like its just getting worse. ANy suggestions to treat this because currently i wipe down my tanks walls weekly cause its growing so fast and im having a hard time cleaning off plant leaves from it.

Also i feed my fish 3x a day cause there is so many should i lower it to twice a day?