Hello fish folks! I recently made some changes to my 29g tank that have been overall really beneficial, however I'm having a hard time getting my co2 back up to 30 ppm. Previously I was running a fluval 80g regulator hooked up to a paintball tank with the little fluval diffuser disk that the kit comes with. In the tank I had a Penguin Bio-wheel HOB filter and one of those hydor nano powerheads, but the circulation in the tank was pretty poor. There were many deadzones and I was having lots of trouble with algae. However, I had no issue getting the co2 up to 30 ppm (using a drop checker) with 2-3 bubbles per second. I decided to upgrade to a canister filter and now have a Penn Plax 700 running. I'm using the single outlet and now have great flow in the tank. Fish are way happier! Anyway, I've upped the co2 to 4-5 bubbles per second, honestly I cant count that fast, and the drop checker is barely changing color. Everything about the co2 system is the same, and the plants seem really happy with a fine mist of microbubbles over the tank, however the drop checker is staying stubbornly blue. I know an inline diffuser would be optimal, but not sure that's in the budget at this point. Is there anything else I can change to improve co2 levels? Would using the spray bar instead of the single outlet help? Maybe a larger diffuser? Any help is appreciated!