I have a ASM g-4 with sedra 5000 pump. It has the recirculation modification and the mesh modification. I also have the gate valve around here as well for fine tuning. This skimmer would do great on 150-500g+ aquarium. Also comes with mj1200 for the recirc. Will upgrade to magdrive 2 for a extra 20 bucks. Asking $100, may consider trades on collector zoa's and palys.