Sparsely planted Walstad tank feasibility
I am looking to set up a 20 gallon Neolamprologus Multifasciatus (small shell dwelling cichlid) tank, and I was wondering if a walstad method tank would be possible with less plants than the typical jungle you see. I have heard from somewhere (maybe an old thread?) that Walstad tanks are primarily jungles because of the owner's preference, but how true is that?
The plan is to have a small breeding colony of multies in a shell bed in one area of the tank, with a region of vallesinarius, java fern, java moss, and maybe hairgrass and some others off to one side or in the margins of the tank. Some shrimp, snails, and maybe Thai Microcrabs (if water conditions are compatible) will also be added. Most of the walstad tanks I have seen have been much more heavily stocked than I plan on stocking, in addition to being more heavily planted.
So, how much in the way of plants would I need for this colony of small cichlids in order to be filterless and preferably do few-no water changes?