I'm looking for help with my tank. It's a 150 gallon with a 40-gallon sump using the herbie overflow. The return pump is a Varios 8 DC pump. I have been seriously struggling with CO2. No matter what I try, I cannot get a 1 point drop in PH. I use a Neptune Apex to monitor the PH and a PH pen plus API test kit to verify the Apex readings. Currently, I am using a 20" Cerges reactor with 1" ports run inline from the Varios 8 return pump to the tank. I have tried running closed loop with a needle wheel pump with the cerges reactor. I have tried a Griggs reactor 25 inches in length and 4-inch diameter. A modified calcium reactor. The most the PH has ever dropped was .8. If I had to guess the bubble count is around 15+. It's hard to tell because I have the needle valve open so that I pretty much get a steady stream going through the bubble counter. It's really high. I have read through all the CO2 posts I could to see what others are using. I don't understand why I cannot get CO2 into this tank. Others with similar tank/sump sizes have like 10 BPS with the smaller Cerges or Griggs reactors and are obtaining optimal CO2 levels. Somehow with the largest Cerges reactor I'm still not getting CO2 to optimal levels and more microbubbles entering the tank from the reactor than an in tank diffuser lol.
I would really really really appreciate any insight as to what the problem is or what I should try to get my CO2 to proper levels!? Let me know if there is any additional information about the setup is needed.