Yes, you could do this, but to prevent the caulerpa from being sucked up by the pump, you would need to add a baffle. After adding the baffle you may consider adding a DSB. After doing all of this you may have wished that you just got a seperate tank for a fuge. I love looking at my fuge. There are tons of pods, bristles and shrimps and I could stare at it all day long. I don't though; I look at it at night when the displays lights are out.
Is there any room next to your sump?:thinking: