well i only have a 13.5 gallon and i bought 1 clown loach, just read sum other posts on here, maybe i got the wrong fishbunjiweb said:It depends on your tank setup.
How big is ithe tank?
Are there lots of caves and hiding places?
Do you only have 2? If so they will hide as Clown loaches need to be in a group of at least 3 or 4 to remain active and playful.
Ben