I would get a BRS reactor. They sell them with JG fittings that fit right on a Maxijet powerhead. Jeff is correct, you don't need tons of flow. If you use the dual reactor, put the carbon in the first cylinder and GFO in the second. BRS recommends a Maxijet1200 for their dual reactor. I am running that and it works great. Check with Jojo at Goldfish World. He sells the BRS stuff and may have the reactor and GFO in stock.