This is a hard one... You might consider Crabby Larry's a fish centered restaurant that is also a brew pub. 237 W Butler Ave
Chalfont, PA 18914-3020
Large fish selection... Not sure about lobster.
Los Sarrapes in Chalfont is a wonderful mexican restaurant that has some Mexican fish dishes. I am especially partial to the hauchinango (red snapper) they serve there whole, fileted.