About
OSA Aquarium Superstores & Services sits in Groton, CT, and the first impression is always the same: spotless tanks, healthy fish, and a store that genuinely looks beautiful to walk through. Regulars call the staff "the friendliest bunch of fish nerds you'll ever meet," and that warmth is backed by real depth — much of the team is cross-trained at nearby Mystic Aquarium, so the advice you get on dialing in water parameters, troubleshooting a sick fish, or choosing compatible tankmates actually holds up. The freshwater side carries the floor, with a wide variety of tropical fish, shrimp, driftwood, and some of the best-kept aquarium plants in the area.
One recent visitor pointed out the thoughtful touches that set OSA apart: filter bags pre-loaded with established media and hand-made stones with java moss already attached, ready to drop into a new setup. Hobbyists hunting for something uncommon have found pea puffers and other rare species for sale in Groton, CT — and there's a beloved puffer fish living in the cylindrical tank by the main entrance that regulars stop in just to say hello to. The saltwater section is smaller but mighty, with a strong coral selection and reef-ready invertebrates that have earned the loyalty of marine keepers who used to drive over an hour for a decent store.
One customer credited Emily and the team with helping them go from a single saltwater tank to running both a thriving reef and a planted freshwater aquarium. Staff favorites Emily and Sam come up again and again for their knowledge, patience, and habit of never overselling — they'll test your water on the spot and recommend only what actually helps. Prices run a touch higher than a big-box store, and most regulars consider it a fair trade for livestock this healthy and guidance this personal.
For anyone keeping fish in southeastern Connecticut, OSA is the local aquarium store that makes the hobby feel supported — corals, live plants, and rare freshwater fish available in Groton, CT, from people who clearly love what they do.
What they offer
Fish & livestock for sale at OSA Aquarium Superstores & Services - Groton CT in Groton, CT
OSA Aquarium Superstores & Services - Groton CT stocks corals, reef fish, invertebrates, shrimp, pufferfish, rare and hard-to-find species, aquarium plants and freshwater & saltwater fish for sale in Groton, CT. As an aquarium store serving Groton, CT, it also offers water testing and aquarium consultations.
- Livestock & products
- Services
- Specializes in
Highlights
What makes them special
- Spotless, beautifully kept tanks with visibly healthy freshwater fish and corals
- Staff cross-trained at nearby Mystic Aquarium for reliable freshwater and reef advice
- Unique extras like pre-established filter media bags and java moss stones ready to use
- Rare freshwater finds such as pea puffers, plus a resident puffer in the entry cylinder tank
- On-the-spot water testing and honest, no-oversell consultations from Emily, Sam, and Joe
From keepers
Customer reviews
“It is always a pleasure going into this store. All the staff are friendly and helpful. They seem to really care about the hobby and are always willing to answer any questions.”
— Sarah Berkowitz5.0a week ago“Amazing customer service. Very friendly. Great prices and knowledgeable!”
— Sarah Jimenez5.04 weeks ago“Em and sam are so knowledgeable and have great customer service. They always have a smile on their face and make lovely to shop at this location”
— Blake Tipton5.04 weeks ago“This store is full of people who are passionate about fish and nature in general. They offer some unique and helpful things like filter bags filled with pre established filter media, pre made stones with java moss attached for you, and a lot of really well maintained aquarium plants. Everyone there had great advice for a variety of issues and questions you'd have when putting a tank together or even troubleshooting tank issues.”
— Theo Winnett5.0a month ago“These guys are the friendliest bunch of fish nerds you'll ever meet. If you ever want a laugh and to see some gorgeous fishes and plants, this is where you gotta go. I was nervous to come in at first cause it's one of the only local fish stores around here, but I am happy to report they are one of the best ones!!”
— Katherine Winnett5.0a month ago“Nice friendly attentive staff One thing I must mention with receipt they would not take a return so, I suggest you are aware of this before a purchase”
— Kathy G3.02 months ago“The staff here are always friendly and very knowledgeable. There's always a varied selection of aquatic animals available that have been well cared for. I love going in just to browse and to say hello to the puffer fish in the cylindrical tank they have in the main entry area :)”
— Flynn Roberts5.03 months ago“The people here really know there stuff. Whenever I come in with concerns they take the time to answer questions and recommend me items that will help. I love this store and the employees!”
— cali links5.04 months ago“Staff are very knowledgeable and kind. They are more than happy to help novice aquarium owners. I received some java moss and good shrimp tips from a very nice lady.”
— Olivia K5.04 weeks ago“Beautiful fish store, great selection of fish, plants, tanks, driftwood, etc. huge selection of freshwater fish and a smaller saltwater section, with tons of coral to choose from. The fish all looked healthy and the tanks were all very clean. The staff was also very friendly and helpful.”
— Eric Offermann5.0a month ago
Reference
Frequently asked questions
Note — Store information and services may change. Always call (401) 823-3474 to confirm current availability, hours, and services before visiting OSA Aquarium Superstores & Services - Groton CT.