I took the plant out and tried washing the roots in the sink. They are not slimy at all, the stuff flaked out. I'm still pretty sure that it is coco from the coco pots that had gotten lose in the system. The roots I managed to get washed off are still white.
When I get to build a new cab I have a lot more to keep in mind this time. Right now I don't really have a way of adding in such things easily. Fortunately though it's coming on winter and temps will begin getting lower. The air pump uses more power than either my fountain pump or my power head so there's an advantage on top of the noise issue.
When I get to build a new cab or get a tent I'll be looking into doing a better setup for my situation. I'm looking at the modified nft, most often labeled as low pressure aeroponics or just aeroponics. I'd pump water up from the reservoir and then waterfall back from the plant container. This way the shelving wouldn't have to hold a lot of water weight at one time. It would be interesting to try running it as an aquaponics setup in this fashion just for fun, couldn't do that with a dwc as the fish would eat your roots.
An indoor worm or soldier fly composting bin would break down all your plant leftovers so nothing in your trash for cops to find. Then the excess bugs can be fed to the fish and the compost can be used on outdoor or potted plants.
Pipe dream until I get the money to set up and more space to do so.