I've tried, and for whatever reason, even though I've been pretty successful with other species, I've had really bad luck with clown loaches. I started with 5 back when I started my tank, and lost 3. Later, I tried introducing a few more, and lost them as well. I'm a decent aquarist, but it basically scared me away from that species. I feel bad when I lose fish. And, not to sound cold, but my wallet also feels bad when I lose fish that aren't cheap. I'd love to have a small school of them, but I'm just not sure about trying to introduce more.
My tank currently consists of:
-5 roseline sharks
-2 clown loaches
-2 yoyo loaches
-salt & pepper cory
-an undisclosed number of otos (they always hide, and they're not hearty at all, so I'm never sure how many I have at any given moment)