caligulasAquarium
Aquarium Advice Activist
Maybe the pressure isn't high enough to get the air all the way to the bottom of your tank. Also, is there water in the tubing? How old is your air pump?
Also, I'm glad to hear that your ph hasn't fluctuated too much, hopefully you can sort it out. I'm plum out of ideas now
I got it earlier this year. No water. I added the chemicals, now to wait and see what happens. Fingers are crossed!