aslong as you are going to upgrade the clowns to something bigger thats fine,
when thinking of a pond your options are alot more, fish that are too small will just be consumed by the knifes, so your looking for large robust fish, you could also have some bichirs or a catfish of some kind for some bottom movement, if this is going to be a big pond you may even thinking of a group of tinfoil barbs or silver sharks as a large dither
i will let some of the members who are more experienced with ponds and such to give u sugestions =)