Just wondering if anyone has tried Needlewheel CO2 diffusion and what equipment/pump did you use? how successful was it etc. Not sure if anyone here has tried this method yet but it looks very interesting and should work very well, a good alternative to an inline reactor (which slows down my filter thats why I want to try a needlewheel pump) instead you put the pump inline with your filter, this pump has a special impellor which chops up your CO2 bubbles into a mist and then it enters your tank through your filter spraybar/outlet. So you dont lose any flow, actually you can increase flow if you want with the pump that you choose. A good few people over on Plantedtank forum are using this method with good results. Im mainly trying to source a decent pump to try it with, there seems to be lots available stateside which wont work here obviously, not for long anyway, anyone know a range of pumps I could try it with that wont break the bank, I think Eheim do one but its too expensive, any others out there?