Heyy
IMO if you want a pretty tank which is really colourful having a large mix of tiny fish is a great way of doing it, again that just my opinion.
Here is a list of some really small fishies you could choose from and some links:
http
/www.fishforums.net/index.php?/topic/128756-endler-endlers-livebearer/
Pygmy Corys -
http
/www.fishforums.net/index.php?/topic/104113-pygmy-cory/
Dwarf Corys (Corydoras hastatus) -
Sparkling Gouramis
Scarlet Badis (Dario Dario)- http
/www.fishforums.com/forum/labyrinth-nandids-fishes/13510-scarlet-badis-dario-dario.html
Ember tetra - http
/www.fishforums.net/index.php?/topic/329919-ember-tetra/
Celestial Pearl danio (Galaxy Rasbora) - http
/www.fishforums.net/index.php?/topic/302908-celestial-pearl-danio/
Dwarf Rasbora
btw pygmy corys and dwarf corys are very similar but still need seperate shoals
and if you do get endlers i would suggest getting only males, females are much bigger plus if you have both m and f they will breed all the time and that isnt good for a small tank, they wil overpopulate very fast.
On the bright side males are much more colourful
You could either have 1 or 2 big groups of several species or mix aload of them together, your choice, i am pretty sure the ones listed all work together anyway.
I will let you know if i think of any more!
I hope this helps and please feel free to pm or email me if you are ever suck with anything else
x x x