If you want to breed them, then you need to consider a tank just for them. Clowns will lay eggs in a normal display tank and they do often. However if it is something you really want to go after to raise the fry and make something out of it, they really need their own tank beacuse you need to replicate the natural spawning season, which is spring time. Longer day light hours, 16hrs lights on. Lower salinity 1.019-1.020. More food, you will be feeding 3-5 times a day. And super high water quality, daily water changes usually. Think about spring time.......The mountain snow is melting and rain water all make their way to the oceans and lower the salinity, the natural food sources are plentiful (mama wants to know there is enough food for the fry to survive) The sun is shining longer and the waters warm up.
We have a entire room in our house just for the clown breeding and spend probably about 8-10hrs a day in there with either feeding, topping off water, changing water, changing filter socks, testing water and setting up new tanks for hatch and grow out. It is a stupid amount of work but it is a hobby that both my Fiance and I enjoy together, if not, breeding on this scale would tear a couple apart QUICK!! If you wanna do it, go for it, just be prepared to lose sleep, sanity, and pobably a few friends along the way. Every day is planned around our clowns and we wont be able to take a vacation for quite some time due these things but like I said, we do it TOGETHER or it wouldnt work.
Oh yeah....thats all just to get eggs, havent even talked about raising the fry yet.......