Might want to add a threaded hole in the top for a PH probe, not needed but it is nice. The design looks nice, don't know much about that downflow half of the reactor. Is the thought there so no CO2 can get to the tank? Might want to look at a Aquamedic Aqua bee for a pump, I've had two reactors including my current Deltec with that pump and it works real well.
I use and have bought my CO2 tanks form Oxygen Products. I like getting it refilled at Kost (sp?) fire and Safety.
Dave
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