good afternoon all I know my ph problem is co2 related. I have 90 gal. tank a 20 gal sump with a fleece roller and an aqua max hang on the back skimmer. MY ph was around 7.6. I ran a line from my skimmer outside this raised it so at peak would get to 8.03 to 8.07. I have tried to figure a way to get more fresh air into the tank. the idea i came up with was to get a replacement skimmer pump and bubble plate and run that in my sump with the airline running outside. I would thank anyone with thoughts on this.