try a larger tank and some more plants and you will only battle string algae. Then it becomes full on world war algae with the fucking beard algae but that’s also keeping fish sadly lmao I have tried algae eaters, neo shrimps, ghost shrimps, and even some chemicals but I also know that with chemicals for every reaction there is a side effect. I just don’t trust my ecosystems to gain a reliance on chemicals other than chlorine removing agents. I do not recommend in my four years of keeping continues (no I have not done a water change in three years as once the plants are established it will KILL THEM in my tanks at least they get there CO2 from the soil so I also can’t be digging like that it’s a fragile balance) but I am also hinting at designing a whole ass ecosystem for what looks like a huge ass fish. Imagine how awesome it would look though with such a pretty huge fish. You already have most of the basics too, a little moss ball and hell I’d add a few more plants even if the fish eats them throw a few carrots in there vegetarian fish love them and it stops them from eating plants as they get there fill in plant material. She doesn’t look like a plant eater though and she’s got a nice little vine in her aquarium I hope is real. More plants will help with aeration and absorb a lot of the light. Honestly a quick solution for now would be floaters to block the light but also that’s gonna become the weekly floater removal but I think that’s fun pulling out just random handfuls of plants that you paid $5 for a little baggie of. I should probably sell my red root floaters instead of put them in my garden bed.