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When they start to spread they will be all over the tank. Not just on that one rock. They will take over and cover any other zoas that they grow next to. If your good with that then keep them other wise remove soon. Give them away if you don't want to kill them.
That looks good. Looks like there will be nice hiding places for the fish and lots of flat spots for coral placement. Take your time you'll find something you really like.
I've been using a water blaster for about 8-9 months now. I like it better then the mag I replaced it for. It runs on less watts therefor less heat. I've used mag pumps for years and know there good pump thought.
I'm using the ATO.com with an aqua-lifter pump. Works great.
http://www.autotopoff.com/products/DS1/index.htm
http://www.marinedepot.com/Tom_Aquatics_Aqua_Lifter_Dosing_Pump_Accessories_for_Aquarium_Overflow_Boxes-Tom_Aquatics-OE1137-FIOFOA-vi.html