It's an interesting question, if two smaller skimmers will perform as well as one big skimmer? While comtemplating skimmers for my 240g I thought about going with two medium sized Euroreefs instead of one large one. This was due to the smaller ones being more easily found for sale used and also they would be shorter in height and would fit under a stand better. I've never really heard of anyone doing this though and I found a good deal on a 12-2 so I'll never get to test the idea out either!