I have a divided 5.5g tank with two males.
Algae tends to grow on the mesh divider since it's right under the lightbulb.
I used to have red cherry shrimp in there (the first day I put them in, they cleaned the mesh divider spotless), but the bettas were either eating them when I wasn't looking or stressing them out too much because the number of shrimps decreased, so I set up a new tank for the cherry shrimp, but without the shrimp picking at it (and perhaps less nutrient competition because I took out all the moss to put into the shrimp tank), the algae there seems to be growing even more. At first it was mainly the green algae but lately there has been more of the darker algae. The darker hairy algae mainly grew on the filter baffle, but it seems to be spreading?
What can I do to restrict algae growth besides leaving the aquarium lights on less? I do weekly 30-50% water changes. It's a pain in the butt to scrape algae from all those little squares. I have a few pest snails, but most of them like the glass more than the mesh wall so they aren't eating it.