Sorry, been behind on my forum readings. You can do a dart tank with that tank, but to maximize space, a leca drainage layer should be used. Fish are not an issue, they can be housed safely with darts. Yes, microfauna would still be used. They would be the terrestrial cleaning crew, much like snails would be a cleaning crew in an aquarium.
Since this is your first Viv, I would recommend keeping it as simple as possible. There's plenty of time to build a bigger better tank down the road after you gain some experience. Water features are normally a pain in the butt, so simplifying things just makes sense for a first tank
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