CorallineAlgae
Aquarium Advice Addict
Lainey: Since you're using co2 and not seeing a pH drop I would recommend removing your wheels. BUT.. It's best to still use biological filter media. You should be able to fit a bio-sponge or some other type of suitable surface to keep bacteria inside your filter. It's best to add the new media first and then remove one bio-wheel to let the new media develop a good culture for a week or two then remove the second wheel. I'm sure there are other methods but I've had success doing it this way for two 55 gallon planted tanks in the past.
Regarding your pH, it could always be something in the tank like a limestone rock or calcium rich gravel that's buffering your water. Something else to look out for.
Regarding your pH, it could always be something in the tank like a limestone rock or calcium rich gravel that's buffering your water. Something else to look out for.