i can be done, but your clowns will need to get used to 74*F or cooler water. also, i dunno if you're aware of it or not, but zots only eat live food, so you'll need to hatch BBS daily for them or culture pods. if you're gonna do all that, you might as well set up a SH tank.
i really recommend having a SH tank that's set up for SH from the get-go, and not trying to squeeze them into another tank. you'll have a much better experience with them, esp. if you're new to SH.
HTH