Gonna come back and edit this stand by.
Yup, like I said OK Normal. It's what you get and is sustainable via normal bubbling. Its a number that comes from Henry's Law and the 20.9% O2 in the atmosphere at sea level. Takes work to get it any higher than that.
OK Mosh, Aqua, anybody with a flair for engineering, looking for ideas.
This is how I previously penetrated the res for cables and hoses and such. I print the white 2 part bung, then made molds and poured silicone to make rubber stoppers that fit in the bung tight and hold the cord with a good seal.
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I'd really like to improve on this concept and accommodate more wires (adding 2 pumps and 4 probes) and make it more flexible in terms of adding or removing components.
All ideas welcome, sometimes it is just best to talk it out. Even off the wall shit can lead to a good solution. Whatcha got stoners?