House of Tropicals in Glen Burnie is great. I'm over there frequently and I love the staff. I live in the Annapolis area and it's an easy drive. When I lived north of DC, I used to go to Congressional in Rockville. I haven't been in many years, but it was great when I frequented it. There is a newer shop in Timonium that I haven't been to yet called CTE Aquatics. I've been meaning to check it out, but haven't gotten around to it yet. If you do, let me know how it is!