You have lots of options for a community tank especially with the size of your tank..
For a community tank Corydoras are a must for the bottom Crew... I have been enjoying watching my 12 cory's run wild around the bottom of my 40 gallon. They are in 3 groups of 4 (sterba, julii, panda) the many different varieties of Corydoras make it easy to find one's you will like..
kuhli loaches are a nice bottom dwelling fish with a unique look that would have fun getting lost in your tank.
A couple smaller plecos (bushy nose, rubber lip, clown, zebra)
You could unleash a few different varieties of live-bearers and let them go at it.
You could do a barb tank, (Rosey, Odessa, 5 banded....)
some rohombo barbs (AKA, snakeskin barb/orange buffalo barb) they are very peaceful and look good zooming around any large tank and stay below 3 inches.
Gourami's are ok for medium size fish but don't get along well with their own kind in groups.
Some electric blue acara’s or some other south American cichlids like Rams or apistogrammas.
Th size tank you have you could easily do around 25 to 30 small fish of different species