Disclaimer - not my first rodeo. Tank has been running for about a month (including the plants)
15G Full tank shot:

The fish are ember tetras. Sometimes one or two get separated from the group and the hover, paralyzed by fear, until they catch sight of the others and rejoin the school.
Plants include hornwort (I keep it around to soak up nitrates, and so far it's resulted in near-perfect water quality), hygrophilia polysperma (world's easiest stem plant!) and some crypt wenditii (because I paid for flourite, dammit, I'm gonna get some root feeders.) In the back is some corkscrew vallisneria, but it's mostly melted. I dose with one pump of ThriveC per day.
The stone is ouko stone, and the tank is filled with approximately a 1:5 ratio of tap-RO water. Water in my area is approx. 24gH (not 100% sure, I lost track when I was fiddling with the kH/gH test kit).
Unfortunately i'm currently experiencing a hair algae outbreak in the hornwort, which is not pretty, but only if you look at it from the top.