To give you some idea, I have a 65L mature tank and an oversized internal filter (which helps increase stocking amount, within reason) and I've got the following fish:
5 Pearl Danios
2 Rams
2 Peppered Corys
3 Otocinclus
And I'll be adding a couple of dwarf gourami's soon. Frankly I'm not happy to add any more than that, and some might question if the Pearls should be in there.
Don't overstock, essentially what you'll end up doing is kill your fish in the long run-or stress them out enough that they won't show their proper colouring and personality.