i've tried aqua dreams, coral reef, emmons, silver lane, the one in wethersfield next to bed/bath/beyond, and the one in rocky hill near the old ames building.
so far, the best selection is at aquadreams, most knowledgeable people at coral reef, best pricing at rocky hill, worst luck (fish death wise) emmons. silver lane had decent selection, but priced worse than aquadreams, and the one in wethersfield that had "an expanded saltwater setup" had 3 fish in it. the one over in manchester near raymore/flannigan was probably the most expensive store i've ever seen.