Pete, Do you have enough volume left in your current sump in case of a power outage?
I don't know how you drain into your sump, but I would assume it's with a overflow or maybe the tank is reef ready. In any case... to me it looks like the sump would overflow if you lost power?
Back to the topic... I am going to use some of the suggestions czcz gave me regarding using a wet/dry/sump and injecting
CO2. Your setup is not a wet/dry but rather a sump while my setup is a wet/dry (trickle) then a sump. I am going to attempt this with hopes it will work.
I know it would better if you could put a top over your sump to help minimize
CO2 loss, but not required.
If you can keep the overflow from "sucking" to much air and keep the water turbulance in both the sump and the tank to a minimum I would believe you can maintain decent
CO2 levels.
I have not started injecting
CO2 into my system yet but when I do I am going fully pressurized, since I know I will need to inject more
CO2 than a
DIY system can provide to make up for the fact I have a wet/dry (trickle filter) in my current setup.