Hi,
A 24x12x16 inch tank should be ok for 2.I personally have 4 small ones.
Clown loaches do better in groups, but i think a pair should be fine. A hiding place or cave is a must otherwise they'd shy behind the tank and not display their zany behaviors. Size wise, if you buy small ones, it'll be ok, but once they grow bigger, it may become a problem.
Just a observation, my clown loaches chewed up my expensive plants, but left the cheap plants alone. No idea why the preference. You mentioned that your tank was heavily planted, so if you have a precious plant in there, you might wanna consider again. But they're soo adorable. If you can, set up a tank big enough just for them, and get 6 or more with lots of nooks and crannies. They're a great bunch to watch at play.
Hope this helps!
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