Clown loaches are really peaceful. So you could pretty much putt anything you want in with them.
You just have to take into consideration, that they grow really slow. So don't put anything in there that will out grow them, like many of the preditory fish.
You could make a really nice 125 community tank around the clown loaches. Or anything else that you thing won't outgrow them and eat them.
Yeah they would be fine, my LFS has a big discus display tank, with a bunch of different size discus and about 6 clown loaches, and a bunch of corydoras.
I use to have my clown loaches in with a bunch of frontosas. The mix of orange and black stipes, with the blue and blacks stripes was pretty cool, on the light sand.
Plus they all grow really slow, so they would be a good match.