Do mean omit the reactor? I have an XP2, will it still work? I was thinking you could only do that with Eheim Classics. where the water flows into the bottom and out through the top.
I meant, omit the CO2 in on the reactor, but on the XP2, I'd say just try it and see. The reactors definitely affect flow rates a little bit, so if you can get away without one, do it. Anyone with XP2's have experience with CO2 into the filter?
I am. I have an XP3 and the only problem I had was that I did not have a valve in the CO2 line and one time the filter got clogged. Then some water was sucked out through the CO2 line. But now I have a valve, so that won't happen again. I have had it running for almost a year now.