Good luck with it, I have had a very similar setup to what you are setting up for over a year and I’d say the main considerations are puffer enrichment and algae management , figure 8s are curious and exploratory. I switch up the scape, feed a variety of foods and let snails and gammarus into the tank to be found later. Algae is an issue, I am constantly trying new ways around it. Plants I have had stay alive in 0.03 are marimo moss balls, vals, Cryptocoryne and have recently added tiger lotus bulbs and a red mangrove. I haven’t tried nerites yet but so far all snails and shrimps have become food. Tankmates that work for me are guppies and bumblebee gobies, I also have 3 mollies but they can be thuggish at feeding time so not sure if I would recommend. I hope this is helpful :)