I use pots for plants that need dirt but would love to carpet my inert substrates (fluorite or stones), however the popular carpet plants all appear to be substrate feeders. I don't want to have to disturb the substrate at all by adding root tabs or the like once it grows in, would have to get all it needs from the water ferts. I've thought about using ferns but that would make more of a jungle rather than a 3" or less in height carpet. I'm not a heavy trimmer and prefer naturally overgrown tanks so having to 'mow the lawn' constantly would not work for me either. Perhaps some type of moss? Any ideas would be welcome, thank you!