[Canadian Man]

Hmm still not making sense to me

Anyway, This is the one that's been around the block and back I assume?

I have seen another reefer modify this type of design with a hole in the bottom box that was threaded for a 1/4" john guest type valve. This then connected to the recirculation loop to get rid of any trapped air in the bottom box that may accumulate.

You should also shoot for a ph in the reactor of about 6.7 to 7.0. I have found with mine that if I let the ph drop to around 6.5 than bad things start to happen at that point. Co2 accumulates, media turns to mush etc...