Hey folks, thanks for everyone's responses and your patience with my replies. For some reason, I'm not getting notified of responses via email like I thought. Most likely user error.
@The8thChevron - I *love* this idea and I'm now looking at both Hydroguard and Orca Liquid Mycorrhizae. I already add Mycorrhizae to plenty of my house plants but it never occurred that I could foster a culture in the reservoir itself. Definitely going this direction here shortly since I've just come off of a very thorough res clean.
@Nor_Cal_Kannabliss - Luckily, my tank's already blacked out. I'm using the (AutoPot 12.4 Gallon Reservoir)[https://www.autopot-usa.com/all-products/12-4-gallon-solid-reservoirs/12-4-gallon-solid-reservoir/] with a grommet on top for my dehumidifier to snuggly run a line into to drain into. No light /should/ be getting through but I'd have to stick my PPFD meter in there to really get a good idea.
That being said, I'll be going full steam ahead of the embracing of some beneficial cultures in my res.
@HarbingerofHarvests - My understanding is there are a few types of algae that do thrive without light in a nutrient solution and they do happen to be red (I know my father ran into this with his reef aquarium several years ago). I'm wondering if I somehow managed to cultivate some of that; however, considering the most likely answer is most often the correct one, I'll double check for light leaks in the res. My response to
@Nor_Cal_Kannabliss has a link to the res I'm using and the think is basically a black trashcan with the whole in the lid covered. Chances of light are minimal but not impossible.
You mentioned lots of air getting in, my understanding is the O2 in the water with several refills should be enough to maintain proper oxygen levels in the water but I know tons of people run air stones in their res's. What's your opinion on said air stones?