I have a 10 gallon here I'd like to start using- and small tanks are a challenge to make into an interesting, varied and compatible community. But I enjoy that challenge! Here's the idea I've been kicking around. I call it 'Fire and Ice.'
1x Dwarf Gourami 'Powder Blue'
6/7x Ember Tetra
3x Otocinlus (algae)
3/4x Ghost Shrimp (I love 'em for detrivore duty)
This should cover all swimming tiers and give me interesting things to watch.
The aquascaping will be lots of simple plants like Hornwort and Egeria ('anacharis') for cover, with some Egeria drifting on surface. Also, pieces of driftwood heaped for 'caves'. Hopefully this would put the Gourami at good peace.
I'm confident I can pull this build idea off, with one uncertainty- would the DG eat the small tetras or ghost shrimp? I wouldn't have much of a problem with the latter, in another tank of mine a betta occasionally takes one. They're cheap live nutrition!
Another possibility I could have is to not go with the Otos and instead use a snail for algae eating. That would free up some space for fish, but I don't know what's nano enough to go there aside from pygmy corys (I can't find them at -any- local store). Is there any small low-tank tier fish that does good singly? I doubt it.