Looks clean. Add more snails, and manually place the snails in the algae-infested areas. Rip off by hand what you can, rinsing your fingers in a bowl of rinse water next to the tank after every pinch. By reducing the load, the snails are able to take care of the rest. That HOB filter looks like it could benefit from a black piece of acrylic to avoid algae growing in it?
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