Woodbridge, Va.
I actually have two favorites....for coral I have to say that Marine Scene in Herndon, Va. Their coral is outstanding, very large. They have excellent fish, I just have not purchased any to see the outcome.
For fish, I really like Maru Pets in Fredricksburg, Va. They quarantine everything for 10 days, if you see something you like that hasn't been quarantined long enough, you can hold it.
You can see that I don't mind the drive, both are about 25 miles from my home, one north, one south, if the quality of the livestock is superior. I have been very pleased with both.