Hokey dokey. Clown loaches get to be big, like a foot long and also chunky, so they take up a lot of space and need a fairly large tank. They can be community fish and plenty of people keep them with smallish tetras without an issue. many people also keep them with cichlids.
Unfortunately, many people buy them without knowing much about them because they are great snail eaters. Most loaches love to eat snails. Clowns do best in groups of at least 5. They tend to "sleep" on their sides and they end up in funny positions and can trick new owners into thinking they are dead.
They do fine at regular tropical temps. They are somewhat sensitive to medications like corys are. They are good cleaners, but do not eat algae and still need to be fed and just left to eat other fish's leftovers.
They have a lot of pesonality and are very fun to watch. They do grow slowly, but once they reach full-size, they really look very different formthe tiny little guys you see in petstores. Still, they are a very fun and rewarding fish to keep. IMO