Yeah, it’s mainly to keep the brown algae at bay. I currently have only Trochus snails, and they are only interested in the algae on the glass. The Tomini Tang eats a good amount of it, but only at a few places; it has a preference for three spots at which it grazes. My Forktail Blenny eats only a little bit of it as it prefers TDO pellets and Mysis. I don’t have crabs in my system, so I’m looking at other options to handle it as the system matures.Question...why are you scrubbing your structure? Is this to remove algae? I would try and keep it going to build up the beneficial bacteria and use a CUC to maintain algae control