Doesn't even have to be a 10. I just happened to have one lying around at the time. Also, what I did was set the rearing tank up such that it was at the same height as the main tank (top) then I used a 1/2" pvc tube to fill (syphon) the rearing tank and used a 1/4" tube that drained from the rearing tank to the sump and kept them running. So essentially, I had a separate tank that had the same water parameters as my reef tank. I used one of the wife's panty hose wrapped around a filter sponge around the end of the 1/4" tube to prevent accidentally sucking any fry into the sump. (OK, it was really my pantyhose). But anyway, this seemed to work.
I bought rotifer eggs from Florida aquatics or something like that for about $10. They take a week or two to get going, but if your clowns are spawning, chances are they'll spawn again.
I say you give it a chance. It's a lot of effort, but I think it's really cool seeing these little fish metamorphosize into little clowns. If you're successful, you'll be able to get your money back in store credit.