i'd like to suggest as a possible fix (assuming it's an internal reactor with a powerhead) is to take advantage of the powerhead's venturi intake, if it has one... if not, then you can basically create your own very simply (thanks to tom barr and his site for this info). put an additional airline connector just like the one used to input the CO2 at the very top of the reactor where the bubble is forming. Connect the other side to either the venturi intake of your powerhead if it has one, or directly into the water inflow if it doesn't. It should work the same either way. The idea is that the pocket of O2, etc will be sucked out of the top of the chamber before it grows too large, and chopped into fine bubbles which are shot back into the reactor... pretty much all of the CO2 should have either already dissolved, or will dissolve during the churning of the reactor... any O2 or other gas will flow out of the bottom of the reactor and up to the surface of the tank to be released into the air. I've mentioned this method on another thread, but I'm not sure I explained it very well... if in doubt, visit the barr report website and check out the diagrams of the DIY internal CO2 reactor. It's all there. Since switching to this method of CO2 injection, my CO2 levels are way up at the same bubble rate, and the reactor doesn't get bogged down with too much gas.
if your reactor is an inline external reactor, then I have no real help other than what was already mentioned... double check your bubble rate, water flow rate, and possibly install a release valve (trickier on an inline setup unless you don't mind a little squirt of water out of the line or possibly having to re-prime your filter)
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