CO2 advice

[martym]

Thats the issue I'm having. How else do you keep the Ph in the MD from dropping, if the Rx is running all the time?

[tang daddy]

technically if your rx comes on at 6.7 and goes off at 8 then either you have 2 ph monitors or you have set it wrong!!

the ph set for your monitor should kick off at ph 6-6.4 and on at 6.5-6.8, that is my understanding and as for your md it should hold at ph 7.8-8.3 with your lights coming on and off.

Mostly everyone on here will agree or have the same standards in mind, if you already have kalk dripping into your tank it should balance it out.

really it's up to you but if your reactor is not holding a 6-6.8ph then the calcium cannot melt therefore not meeting the demands of your tank.

My PH level runs at 7.8-7.9 w Cal reactor and dripping Kalk at night. I gave up worrying about it and let it sit there - no ill effects are observable after months in that range.

One thing that helped a little was running my effluent into my skimmer - seems to blow off more CO2 before it hits the main tank.

You may also want to make sure you are refreshing the air in your room - my ph goes up abit if the house is empty, and drops abit with more bodies. Opening a window near the tank helps stabilize those swings...

[martym]

Tang Daddy- That is basically how it is running. I do have 2 monitors. But for me the controller is in the main tank. The monitor is in the effluent just before it drips into the tank. So when the tank is above 8.01 the Rx turns on. The effluent then drops down to 6.7 and remains there until the ph in the tank drops below 8.0.
Yesterday for an example, I managed to leave the window in the room where the aquarium is open all day. The Rx came on at around 10am and was still running when I went to bed at 9:30pm. The Ph in the MD is at 7.9 this am (5:30am) So it is running, and maintaining the values that I'm after, for the most part. My Alk does dip down to 7DkH just before my bi-weekly WC. My concern is the Ph in the main display had dropped to below 7.8, which is a bad thing. I was hoping that I could keep it up a bit higher than that.