Looks like you are going to set up a very expensive system, when you can do the same with a cheap pump and a regular 5gal bucket. Unless you have those parts laying around anyway. The pump also mixes up the solution each time it doses.
I can't answer your question wrt the oxygen, but I noticed that when I only mix KNO3, K2SO4 and maybe MgSO4 I can go for 4 weeks without mold growing or strange smells developing.
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