Fluid Dynamics in Deer Park, New York, has earned a devoted following across Long Island for a simple reason: the fish are healthy, the tanks are immaculate, and the people behind the counter genuinely love what they do. Owner Jared and staff members like Brian, Tyler, John, and Cory have built something that feels less like a pet store and more like a proper aquarist's workshop — one where every tank gleams and the livestock is sourced with care, including hard-to-find species imported from European breeders known for sustainable practices. The freshwater selection alone is worth the trip.
Reviewers rave about rare nano fish, large Frontosas priced under $100, beautiful African cichlids unavailable elsewhere on Long Island, Bolivian Rams, bristlenose plecos, and quality shrimp. The saltwater side is equally compelling — one customer picked up a tomato clownfish at a fair price, and the store's reef expertise has rescued at least one 800-gallon saltwater tank that other companies couldn't get right. Coral enthusiasts and planted-tank hobbyists will find beautifully scaped display tanks and fully submerged, healthy aquatic plants — a detail that experienced aquarists notice and appreciate.
Beyond retail, Fluid Dynamics operates as a full-service aquarium company. They fabricate custom tanks, maintain residential and commercial systems, and offer the kind of unhurried consultation that big-box stores simply can't match. Multiple reviewers describe walking in with questions and leaving with what felt like a free masterclass — staff will even disassemble a working filter to demonstrate its features.
The store itself is clean and well-organized, with crystal-clear tanks and an atmosphere that invites browsing. Prices are consistently described as fair to surprisingly good. For Long Island aquarists — whether they're setting up a first freshwater tank or troubleshooting a mature reef system — Fluid Dynamics has become the local fish store that others get measured against.
teamsalamone
20 reviews
I haven’t been there in quite a while and it very refreshing. They remembered me and the store is gorgeous. Spotless, and it is growing. Filled with the most amazing fish!! How lucky 🍀 we are to have a real local Fish store like this …. It’s got great stock; great advice … open till 7 on Saturday… this is a Winning 🥇 place and I am glad to be able to come here. Btw the prices are insane … good! Huge Frontosas for less than $100 ! Love this place
Chris
2 reviews
A lot of unique and beautiful African cichlids that are not found anywhere else on Long Island would definitely recommend checking them out
Aaron
2 reviews
Nice local store with a wide selection of fish. Good prices! Must visit!
Ekramul Huq
6 reviews
Visited Fluid Dynamics Intl Aquarium Services and Store for the first time today and had a great experience. The staff was very welcoming, professional, and genuinely helpful. They took the time to understand my tank, my future plans, and whether I’m focusing on fish or coral, and gave honest advice on what would and wouldn’t work. The store is clean, the tanks are well maintained, and the fish looked healthy. I also picked up my first tomato clown from here, and the price was very fair. Overall, I felt comfortable asking questions and never felt rushed. Highly recommend this shop.
Sydney Gould
13 reviews
Absolutely one of my favorite fish pet stores on Long Island. They are one of the few places that routinely has a stock of interesting freshwater nano fish. I have purchased fish from here multiple times, and they are all beautiful and healthy. The staff has always been knowledgeable, friendly, and helpful, and the store is lovely and clean. Highly recommended!
Evan H
4 reviews
Excellent selection of fish that are meticulously cared for. Very knowledgeable and friendly staff. Purchased 5 African Cichlids that ate immediately after adding to the tank and are thriving.
Mikhail Rosenbloom
42 reviews
Great aquarium store. Super clean great selection. Fish looks healthy. Bought bolivian Rams and bristle nose plecos, shrimp - all look healthy after 6 months.
Michael Sheehan
35 reviews
Great shop! Huge selection and experts able to help you make the best choices for your aquarium
Mario S
5 reviews
I stopped in the Fluid Dynamics for the first time, and what a great surprise. John and Tyler are both awesome. These guys know their stuff and are willing to share an Aquarist knowledge to the hobbyist, truly miles above big chain stores. If your passion is freshwater or saltwater, coral or planted tanks, hardscaping or you just need to see what a real aquarium shop looks like, this is the place.
Fig
13 reviews
Quality fish.
Note: Store information and services may change. Always call (631) 208-5302 to confirm current availability, hours, and services before visiting Fluid Dynamics Aquarium Services and Store.
Phone
(631) 208-5302Address
832 Grand Blvd, Deer Park, NY 11729
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832 Grand Blvd, Deer Park, NY 11729
February 7, 2026
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