Hi matt when i got my am1000 it was driven by a Eheim 2076 and like you had problems with gas pockets collecting. Solved by replacing the 2076 with a dedicated circ pump. I fitted a seperate intake and coupled it to an Eheim 1260 circ pump going back in through a double length eheim spray bar, so I have a dedicated co2 circuit.. What can I say mega flow and at first I thought it may be too much but no, 100 or at least 98% saturation with no bubbles eminating from the bars at all. I have the pump coming on 5 mins before the gas and it works really well. The flow just seems to give this curtain of saturated water and the difference in my plant growth is mad I have anubius producing new leaves weekly and moss growth where weekly pruning is a must. Hope this helps Colin.