Are you having a problem not passing enough flow through your system? Odds are if you talked to your doctor about it, he would recommened the AquaDriver T50 setup. Its really very simple. The system works by attaching the unit to a wavemarker or pump over in Europe the Tunze Stream’s are popular. After that, the flow the streams produce powers the T50 system by using a complex system of gears and turbines. The result is nice random flow that should make your reef happy. Don’t expect to see these in the US anytime soon, but if you live in the UK you are already better off as some stores over there seem to carry them for 99 Euros ($136) or 89.12 in UK pounds.