I have a 20 gallon, with Ocean Direct Carribean Live sand and BRS Dry rock, 10 gallon sump with a skimmer, a refugium (soon), and a return pump chamber; currently cycling now.
I wasn't sure what to do about a clean up crew, I was thinking a few small snails like maybe 5-10 Ceriths and 5 or so Nassarius, with a cleaner shrimp. Was still doing some research on it, but I've read you don't really want/need hermit crabs with a nano, is that right? correct, various snail types are desirable
As for stocking I was thinking of adding a firefish goby first, then a few weeks later adding in two clownfish. That is all I really had in mind, I would love to do a watchman goby/shrimp pair as I love the symbiotic relationship, but I'm not sure if they would be too big for a tank this size. A pair of clownfish is marginal in this sized tank although the firefish should be fine. But that would be the limit
As for corals, I was thinking mostly soft or LPS. I like the idea of watching the polyps swaying in the water.
I think this is a great thread, any ideas suggestions would be great, my worst fear is hurting a fish by not keeping it in a proper habitat! Thanks!