The only places that I have found are:
Aquatic Obsessions in Avenel, good prices and friendly service the owner is on site most of the time.
Red Sand Aquarium in Dunellen, good prices on corals if he has any. they go fast. fish selection isn't great and some seem to be emaciated.
Underwater world in Roselle, dry goods selection not to big if any. I've gotten some really nice Acans there.
Ocean Gallery 2 in North Plainfield, good selection of fish, corals and other items. Customer service is a hit or miss depending on who helps you.
Pet Shanty in Scotch Plains(right down the road from OC2) never been there so I can't say.
Animals and things in Woodbridge, (up the road from Aquatic Obsessions)very big selection of dry goods, large selection of tanks if your in the market for an upgrade and such. There staff doesn't seem to knowledgeable though. Not much on corals and their fish are a hit or miss.
I might take a ride out to Something Fishy someday to see what they have. Oh BTW, there is another in central NJ, I went to it when I was a teen and had a FW
tank. It was called shark Aquarium on RT 22. they have since moved and I don't know if they kept the same name or changed it. maybe someone here can chime in.