So, I've been working on this for the past, oh, 2 months? I turned the 20 gallon long into a riparium. I'm pretty happy with the result, still waiting for plants to fill in and open up (especially the one close to the left, with the large round leaves. It's new though, in a few days it'll re-orient itself I hope)
Tank inhabitants are MTS, pond, and ramshorn snails. I also moved the new baby betta over there (either temporarily or permanently, depends on how she likes it) from the ten to help combat the planaria and whatever those little mite/bug things are. She really likes to snack on them. Cleaned the whole ten gallon tank of them in less than a week, and there were hundreds.
The water is really shallow though, maybe 4 or 5 inches deep at the most. I'm having trouble finding aquatic plants that can manage in that water, that won't grow out too far. I'm looking for smaller crypts to fill it in.
Oh, and the sand is Black Diamond Blasting sand, fine grit. I really like it, although it's a bit more 'sparkly' than I had hoped. 20 Long Riparium - YouTube