as mentioned, you'll never keep up the proper feeding density in a setup that large, esp w/only 4 zots. also, besides the clowns and the angel, 'nems (or anything else that has a sting) are not good SH tankmates.
it might do well for you to really research keeping zots, as they require different care than larger species SH, and you need to be super careful about adding anything that isn't "sterile" to the system, as the abundance of small live food items can result in hydroid blooms which can kill zots.