Hi Dave, by 'issues' I am guessing that you have cranked up your CO2 bpm to the point where the reactor is being inundated with the gas?
Assuming that is what you mean, I too have this problem during the warmer parts of the year here in Australia. There is only so much CO2 I can bubble into the reactor before it just starts gurgling away unable to dissolve the gas fast enough. If I were to switch to a more powerful circulation pump, I'd just be pushing the gas out the bottom of the reactor and into the tank, which would help a little bit, but, a second reactor would be the ideal way to go (I think).
My tank is about 100g. I currently have an AM1000 hooked up to an Ocean Runner OR2500 which generally works quite well. It is winter here in Australia at the moment, so gas is dissolving quite well with the cooler temps. When it starts to warm up again, I may plumb a secondary AM1000 into my Eheim 2217 return. I would prefer to have a secondary dedicated pump, but I don't have the space for any more hoses running back to the tank and don't think my existing hoses could handle the extra flow. So even if I bumped my OR2500 to a more powerful pump capable of powering 2 AM1000's via a split in the line, and then a merge after the reactors, I think I would also have to change my plumbing. Maybe something for me for down the track.
Yean, single CO2 source. I think it's best to do this with a regulator that has multiple working pressure outlets? Currently I am splitting my CO2 immediately after a single regulator with a 'T', each branch of the tee has a seperate needle valve and bubble counter - one branch feeds the AM1000, the other branch feeds a powerhead connected to a spray bar running through the thickest plant beds in my tank.
Scott.
Scott.