Personally, I would check with Batfish since he's both a sponsor and member of the club, but it seems that a several of you contacted Les after hearing the talk and wanted to know where to get Cobalt goods. Here's his response to the group:
Tom's Tropicals, Tropical Lagoon, Winchester, Centreville, and Vienna will have the most product on hand. Here's the full list. There are no stores actually in DC that I know of.
CONGRESSIONAL AQ ROCKVILLE MD
CONCORD PET 15 ELKTON MD
GO FISH LLC ROSEDALE MD
AQUATIC CREATIONS LTD IJAMSVILLE MD
TROPICAL LAGOON AQUARIUM SILVER SPRING MD
BELTWAY AQUARIUM GREENBELT MD
Corner Critters Leonardtown MD
House Of Tropicals Glen Burnie MD
OAKLAND'S TROPICAL WORLD OAKLAND MD
PET DEPOT TIMONIUM MD
RICKS FISH & PET SUPPLY FREDERICK MD
SCALES & TAILS - LAVALE LAVALE MD
TOM'S TROPICALS BALTIMORE MD
WOODLAWN TROPICAL FISH BALTIMORE MD
CENTREVILLE AQUARIUM CENTREVILLE VA
QUANTUM REEFS LLC SPRINGFIELD VA
VIENNA AQUARIUM LEESBURG VA
REEF ESCAPE LLC FAIRFAX VA
WINCHESTER AQUARIUM WINCHESTER VA
PETLAND-FAIRFAX FAIRFAX VA
PETS PLUS INC. STAFFORD VA