I use to work near Ely's and I found their prices high or even higher than Absolutely Fish prices.
Here's the info for Shark.
245 Route 22, Hillside, NJ 07205
Hours Daily 10-8, Sundays, 10-6
If you're coming from Newark, it would on that side of the highway. If you're coming from Union, you'll need to make a U-turn once you past where the car dealerships are.
This place has been around for at least a decade, they use to be in Union but moved a few miles down in Hillside. I haven't been to their new store since they moved.
I've talked to the guy at Aquarium Paradise (Aquascape Online store front) in Belleville and I think he mentioned he use to work with Shark Aquarium and hence the reason he specializes in piranhas too.