Hi bazz, you did not missed it, i did not tell. It is the aqua medic 1000. I am outside spec with flow but I hope this will not be a big problem. Maybe the turbulence will be a bit less but as long as there will be no CO2 bubbles coming out on the outflow i will be happy. Otherwise i have to upgrade.Sorry if I've missed it but what reactor are you intending to use?