I would love a refugium, just no room. The best I could do is a light on the sump at night and an egg crate basket with Chaeto. To get water movement around it there is a little surface skimmer I put near it. Its not enough to turn or blow the Chaeto around, but enough to keep water flowing and not stagnant there. What I am noticing however is the amount is getting smaller as little strands keep flowing out and into the sponge between my main chamber and pump chamber. Any recommendations for an alternative Macroalgae that would hold up better?