How long is the tank? Ideally it's at least 4 ft, then as they grow they'll need a larger (8-10' tank). This link might help some: Clown Loach (Chromobotia macracanthus) — Loaches Online
They are cute, fun fish but need a huge tank which isn't do-able for most of us (sigh).
If they're really small when you get them you might be able to start with 3-5 in that tank but as they grow you'll need to upgrade. Not sure if even a 60 gal
would be enough for small ones, maybe someone else can confirm that.