Steve,Welcome,
If you're looking for good aquarium stores near Manchester, try Fish Mike Aquatics. His saltwater section is small but he's a good guy who takes good care of his fish.
If you're willing to drive, Jay's Aquatics in Salem, NH is the best place for corals in South NH, his fish selection can be spotty but he gets good stuff for good prices.
If you're willing to drive a bit, Tropic Isle Aquarium in Framingham, MA (where I work) is probably the oldest fish store in MA, the owner started the business when he was 16 (he's 77 now). We can get most fish you'd be looking for, but we're in the process of moving for next year so our livestock selection will be halted for the time being.
Tropic Isle is still around? Great! It was my main go-to store in the mid-80s to late 90s. Always had good fish, coral and rock. In fact bought my first MH fixture there.