This is a dumb question but I have to ask :p
I have this type of sump:
My problem is that the current pulls the macroalgae through the unit, into the pump and the algae ends up in my display tank. I have some rubble rock in the baffles (I hope that is the right term) but clearly not enough. I don't want to constrict the flow too much... I need a better method to keep things put. Should I put some plastic screening material in there or something? If so, how do you attach it? Or, can you bundle the plants and attach a weight to anchor them? I've tried to put the macroalgae where that drain sock is. It gets sucked through those narrow cut outs and it's not working out too well for me. Any suggestions? I used to have that compartment filled with plants. Now I have zip.