Nice looking tank, thanks for sharing. It isn't so overstocked that you're doomed, I think. More frequent water changes, and perhaps more filtering than typical, and you have a really rewarding tank. I'd like to see updates.
As everyone always says, the challenge with nanos is how quickly they can go bad. Manage to keep parameters steady, water clean, you're all good. If you're up to it, get yourself a test kit, and do some monitoring. Math out how much food your fish need, pollution you add with feedings (poop), and how quickly nitrates build up. That can guide your frequency of WC.
Morally, it would help to have a second cycled tank and filter ready just in case of trouble. Also a good place to grow out plants, etc. without worrying about the 'scape. (And then, MTS...)
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I can only grow plants when they're completely under water. Everything else is doomed.