Clown loaches are definately schooling fish. Even 2 together will be lonely......... Stock them like they're just big playful tetras. It really is quite something to see them together. They develope a pecking order and pal around together. Mine used to school with my tetras as well. I had 2 angels in the tank with them and they left them both alone. I only noticed a few times when they would follow one of the low dangling fins, but they never did any damage. On another fish message board someone made the cutest video of their loaches out and about. They set it to the Mission Impossible theme. I'll try and find it and link it here. I remember they had a really nice set-up with lots of caves and plants.
Ok.... now I'm just rambling. I should use this energy rearranging the tank or changing water or something.