My 135gal houses 8 corys, 5 otos, 10 serape tetras, 9 tiger barbs, 9 harlequin rasboras and there is still plenty of room for fish. With a large tank you have a lot of possibilities.
You should definitely have a good cleaning crew: corys, otos, snails, shrimp. (many species to choose from for all but the otos.)
And anything else that appeals to you.
Tiger Barbs nip fins of slow moving fish but stick to their selves in schools of 8 or more.
Rasboras are peaceful schooling fish.
Most tetras(neon, cardinal, rummynose, etc.) are peaceful and school beautifully.
Cloud Minnows, Danios, Rainbowfish, German Rams, Gouramis, Hatchets are all good choices IMO.