The Ultimate Aquarium

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The Ultimate Aquarium Situated on the Peninsula between San Francisco and San Jose. Serving the San Francisco Bay Area since 1999

Some super great colors on our current stock come check it out before it’s too late!
10/04/2026

Some super great colors on our current stock come check it out before it’s too late!

Love these super special snails! Have a bunch in stock come check it out!
09/29/2026

Love these super special snails! Have a bunch in stock come check it out!

Have some amazing new and unique freshwater fish in stock! Goldfish, big fish, community fish and many fun options! ...
09/27/2026

Have some amazing new and unique freshwater fish in stock! Goldfish, big fish, community fish and many fun options!

09/13/2026
We took a small break from posting but WE ARE BACK!!!Come check out our diverse stock of freshwater and saltwater fish, ...
09/06/2026

We took a small break from posting but WE ARE BACK!!!
Come check out our diverse stock of freshwater and saltwater fish, plants and invertebrates! With new fish every week!

Happy Independence Day!!!Friday 7/3 10am-6pmSaturday 7/4 ClosedSunday 7/5 10am-5pm
07/03/2026

Happy Independence Day!!!
Friday 7/3 10am-6pm
Saturday 7/4 Closed
Sunday 7/5 10am-5pm

Super Deal!! Innovative Marine 20 Gallon Fusion 2 Peninsula Pro Bundle on sale for only $399. Compare to online prices ...
06/25/2026

Super Deal!! Innovative Marine 20 Gallon Fusion 2 Peninsula Pro Bundle on sale for only $399. Compare to online prices of $558!! Only a few left. Take advantage while supplies last!!!

Some clips of our reef systems and some cool coral we got. Always something new and interesting coming in!
05/31/2026

Some clips of our reef systems and some cool coral we got. Always something new and interesting coming in!

05/31/2026

Got some amazing gold fish in this time, a wide variety of goldfish types and sizes come check it out.

Some really healthy and colorful fish in the shop. Come check em out!
05/24/2026

Some really healthy and colorful fish in the shop. Come check em out!

Address

2625 S El Camino Real
San Mateo, CA
94403

Opening Hours

Monday 10am - 6pm
Tuesday 10am - 6pm
Wednesday 10am - 6pm
Thursday 10am - 6pm
Friday 10am - 6pm
Saturday 10am - 6pm
Sunday 10am - 5pm

Telephone

(650) 212-3474

Website

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