Hi Guys, I'm so disapointed its untrue and i'mreally starting to think about giving this up. OK so heres the kit list: Eheim pro 2 external filter 180l tank Rhynox 3000 diffuser Originally I had a aquamas external inline reactor and have never been able to get anywhere near the 30ppm needed for EI. I'd get gas build up and then it would spurt out the filter outlet. There came a point when i couldnt inject any more gas without it wasign co2 and the drop checker never went lighter. Aquamas said my filter wasnt powerful enough for the reactor which makes sence but having upgraded to a larger reactor from them (after them saying my last reactor was too powerful) i'm not sure I have faith in their products anymore. So having saw dans tank I decided to get a rhynox 3000 diffuser and pump the gas out from that and into the inlet of the filter giving better turbulence and more contact time with the water. again I'm hitting a point where i'm injecting gas and it cant diffuse quick enough. Dan was using about 1bps from what i remember and the dropchecker was bordering on yellow and his tanks not that much bigger than mine. So with both ways i'm hitting the same brick wall and i cant overcome it. I dont know anyone who has this problem and i really cant see what i'[m doing wrong and i'm totally disheartened with it. Can anyone tell me what i'm doing wrong?