I am thinking about how to fit an ATS into my sump. The best idea I can come up with due to space constraints is to hang it over two sections of my sump divided by a piece of acrylic. One part is the refugium, the other is the return section. Is there a concern with algae slipping off and blocking the return? My sump could handle the volume if this happened, but would prefer to plan differently if this would be a big concern.

Thanks.