Not in a 10 gallon.
Also, angels are a no-no for a 10 gallon.
I like the shell-dweller suggestion personaly... N. multifasciatus are lvoely little things, quite hardy, do ahve some specific requirements but these are easy to meet and they are very entertaining to watch and rewarding to keep. The only downside is that they breed rather readily so you'll have to work out a way of getting rid of excess fry. Most LFSs would probably take them on if they have an afrcian cichlids section but you may not be able to rpesuade them to buy them for much
An african butterfly fish would just about fit in a 10 gallon - but I wouldn't put anything else with it and I wouldn't consider the tank's size quite ideal - more like 'just adequate'
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One fish you could keep (singly) in a 10 gallon is a paradisefish. Again, a larger tank would suit one better but it'll thrive in a 10 gallon anyway (because they just happen to thrive wherever you put them lol).
Sticking to a gourami theme
- you could keep a trio of licorice gouramies:
http/www.igl-home.de/bilder/gallery/paro...erg.00.orig.jpg - one I realy like is parosphromenus harveyi - you're unlikely to find these in stores, and if you do, they'll be labelled incorrectly
Unfortunately, these lovely licorice gouramies are fragile and you'll need to research them somewhat (there are several other species as well).
OR some of the various wild betta species would work. I like Betta persephone myself:
http/www.bettasplendens.de/galerie/data/...-persephone.jpg But, obviously, there are many, many others:
http/www.ibc-smp.org/species/index.html
OR you could stick with a more 'classic' 10 gallon gourami and get some hardy, but beautiful, sparklers
Killifish are also something you may want to consider for a non-community 10 gallon but I can't realy help with specific species suggestions. Suffice it to say that my favourite killi species, the american-flag fish, is one that looks and acts least like a killi and more like a cichlid/gourami
These are actualy plausible for a 10 gallon themselves but one of the smaller, more typical killi species would be better. Again, with killies you need to consdier what you'll do if they breed - as fry seem to inevitably eventualy appear