Fish Paradise is the only place we buy corals/livestock.
True Perc & Mid Cities we also visit from time-to-time to buy food or dry goods.
If you're in Plano you'll probably want to go to Neptune's cove. Don't have a review for it, never been. Other people go to Dallas North Aquarium, but I didn't like them years ago & I haven't heard great personnel reviews that would sway me to go back LOL.