I took out some of the plants that are more intended for planting as I figured it was only a matter of time before they started to die off, crashing the system. They never seemed to, but the Ramshorns probably kept that cleaned up. Since the light doesn't have a significant depth to penetrate, they must have got enough light through the stems. I can grow even high light plants floating - lotsa light up there. People are forever giving me cuttings so I don't even know the names of most of them, let alone their light requirements. Ignorance is bliss I guess.
Everyone seems fine but the tank is on a lower wrack that I'm admittedly not inclined to look at much. I'll keep an eye on the fish in the AM when I think of it. They were born there so I'm sure part of the success is their tolerance for the conditions. It's also to the side of a patio door which is open to some degree year-round, helping to oxygenate the water.
If nothing else, it's a great little place to grow leftover bits and pieces into plants. I'll never have too many with a couple of tanks of plant-eating snails.
Thanks!