In efforts to maintain stability I've decided to add a 10 gallon, 3 chamber refugium sump to my 20 gallon nem tank. I will be using an overflow box rated at 200gph. My head height is about 40". I'm looking at these return pumps-Sicce Syncra 1.0 and Eheim Compaction 1000. Another option is the Current USA 6009, (I have the loop system for my powerhead) but the minimum gph is 210. I suppose I could run a T back to the sump inlet for an overpowered pump. I'd like to keep it under $100. If there are any other pumps anyone would recommend let me know thanks!