pH suddenly not reaching set point
I have a relatively new tank. I set it up about 5 weeks ago, planted it, and am currently cycling the tank. I have a GLA system for CO2, an inline diffuser (Atomic), and a Milwaukee controller.
Everything worked as expected until a few days ago. My pH is now not reaching the set point, and it looks like, I am sparging CO2 constantly (although I'm not monitoring usage 24/7). I'm getting some algae issues in the tank, but it doesn't look like anything in my return line from the filter where the diffuser is located.
Are the inline diffusers very susceptible to fouling? It seems 5 weeks, with no current fish load isn't long enough to foul the ceramic element, but maybe I'm wrong.
Anything that might be a result of cycling that can affect buffering and the ability to drop the pH?
Anything else I should be looking at?
The drop checker actually looks similar to what it did when the pH was at set point, and the plants are growing like crazy, but I'd like to make sure that continues with a correctly operating CO2 system