Now that’s a great question… sure, there’s a lot you can do that will insure safe oxygenation and seriously inhibit fungal outbreaks 24/7/months if you really think it's that important.
When your oxygen limitation is air or 20% O2, many on the forums say the ideal DO is 100% DO Sat and the only way you can get that is using air is to chill the water to 64-68F, that's it, that's all that is possible to do. I’m sure you have heard this too.
Others would approach this oxygenation issue directly, if a technical grower wants to increase his nutrient DO Sat at any water temp, he would certainly not hope and depend on 20% O2 (air), but would use 30-100% O2 gas. This does require thinking out of the box beyond the average mind set limitations.
Breaking this down to real simple, if you want higher DO, increase the source O2%. Oxygenation does not get any simpler than this and increasing the O2% greater than 20% works great every time, 24/7… that’s real scientific fact. Oh, and dissolve the O2 with a packed column, cone or oxygen -injector… forget the diffusers.
If a man is really thirsty and dehydrated, you would give him more water to drink, right?
If your plants need more oxygen, give them more oxygen, right?
Or, when your plants need more oxygen, give them more chlorine and buy a water cooler?
There ain’t nothing to insuring and maintaining safe oxygenation, this is just common since stuff.
J