This thread is super-old, but the need still exists.
I'm in Silver Spring, MD. Moved here a few months ago and have been looking for good suppliers.
Quick review of my extensive and recent combing of the aquarium stores/big box stores in the area:
Best decor of all kinds, supplies, and plants: House of Tropicals in Glen Burnie - just south of Baltimore. Meh on the FW
fish. Didn't look at Marine.
Best fish: PetsMart in Bethesda - hands down!!! Immaculate tanks, healthy fish, great prices.
Congressional Aquarium in Rockville, MD - huge selection of SW
fish, knowledgeable staff, BUT day after deliveries (they took me they get they're fish on Wed. and I was there on a Thursday), lots of tanks had numerous dead fish in their tanks. Causes could be that their suppliers aren't great, they don't acclimate properly, or they don't inspect their tanks very often. Don't know which it is, but I won't touch their fish or large selection of plants.
Plenty of supplies, though.
Tropical Lagoon just inside the Beltway in Silver Spring: tiny, dingy, not much selection of anything. Nice staff, though.
Keeping my sleeves wet...
~ Sent via Carrier Goldfish