I see you are running a fluval 404 on your tank.
With or without filters? (sponges in particular)
How often do you clean the sponges if you are using them. Sponges can trap a lot of gunk and if not rinsed often and good enough might be contributing to your algae farm.
How is your skimmer performing? Is it pulling out a ton of dark green/black gunk?
Also how big is your cleanup crew?
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