About
Ultimate Aquarium Inc. on the San Mateo Peninsula has earned a reputation as the Bay Area's go-to independent fish store, drawing hobbyists from as far as San José who say the drive is absolutely worth it. Owner Joe and his staff run a shop that covers serious ground across freshwater, saltwater, and koi pond keeping — all under one roof with tanks that reviewers consistently describe as crystal clear and meticulously maintained.
The freshwater selection is deep: cardinal tetras, green neons, pork chop rasboras, corydoras catfish, bettas, shubunkin goldfish, and some striking angelfish specimens that catch people's eyes. Saltwater keepers will find a solid coral selection alongside marine fish and invertebrates, and pond owners praise the store as their reliable source for koi and pond supplies. Live plants are available, though the stock leans toward popular species rather than rare cultivars — something plant enthusiasts should note.
The store also carries a decent range of aquarium supplies, tanks, and décor, though the real draw is the livestock. What sets Ultimate Aquarium apart from the big-box pet stores is the staff's willingness to spend genuine time with customers. First-time aquascapers mention Richard by name for his patience and guidance, and multiple reviewers highlight that the team will test your water parameters, discuss fish temperament, and offer stocking advice without condescension or pressure to upsell.
The store even takes in fish that hobbyists can no longer keep — a small but meaningful gesture that speaks to their investment in the local aquarium community. Pricing gets frequent praise for being reasonable, with bundle deals like three schooling fish for fifteen dollars adding extra incentive. The store sits in an area with limited independent aquarium options on the Peninsula, making it an essential stop for anyone who's outgrown the Petco and PetSmart selection.
For Bay Area aquarists who value healthy livestock, fair prices, and staff who genuinely care about your tank's success, Ultimate Aquarium delivers.
What they offer
Livestock, services, water
- Livestock & products
- Services
- Water TestingConsultation
- Specializes in
Highlights
What makes them special
- Owner Joe and passionate staff known for spending dedicated time with each customer
- Extensive freshwater and saltwater livestock including corals, invertebrates, and koi
- Consistently clean, well-maintained tanks with healthy fish
- Bundle deals on schooling fish at competitive prices
- Free water parameter testing and personalized stocking advice
From keepers
Customer reviews
“Good”
— Brionna Moore5.02 weeks ago“Good price and good selection”
— Sam David5.0a month ago“LFS! Always helpful in answering questions. Support local business!”
— Andy Hsieh5.02 months ago“A great aquarium store. They plenty of healthy fish and everything you need. The staff is very helpful, too. Cheers 🥃”
— James Lynch5.02 months ago“Went to get a betta, some tetras and corys to stock a newly cycled tank. Parameters of my tank are fine but all the fish besides some cory catfish are dead almost overnight. Tetras and betta all looked they had fin rot. Went to Petco to restock and every single one of those fish is doing great. Feels like I wasted $100 on sick fish to traumatize my wife and daughter.”
— Matthew Gonzalez1.02 months ago“Excellent LFS. Knowledgeable, friendly people and a solid range of stock at reasonable prices.”
— Ellora Staker5.03 months ago“I'm a newbie to the aquarium hobby, and so I really appreciate the time the staff here takes to help me out. They've always found time to assist with fish, plants or just aquarium decorations. Plus the selection and prices here are great. I'm never going to PetSmart again.”
— Gal Josefsberg5.03 months ago“Great service and very knowledgeable staff. Will definitely return.”
— greg ford5.03 months ago“diseased fishes, dying corals, everything is at least priced 20% more then any other retailer in the area. Any corals half decent is not for sale but they will gladly sell you the dying , bleaching corals no problem.. Stay far away from this place, its a complete joke.”
— Chang Pak1.04 months ago“One of those expert shops that gives you advice without looking down their nose at you.”
— Tanya Birch5.04 months ago
Reference
Frequently asked questions
Note — Store information and services may change. Always call (650) 212-3474 to confirm current availability, hours, and services before visiting Ultimate Aquarium Inc.