The Ultimate Aquarium

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

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!

Some amazing clams and fish in this week, come check em out before they go.
05/17/2026

Some amazing clams and fish in this week, come check em out before they go.

Some of our classic fan favorites we typically carry in consistent stock! Many more options and a ton of variety here in...
05/17/2026

Some of our classic fan favorites we typically carry in consistent stock! Many more options and a ton of variety here in San Mateo.

We got some fantastic captive bred saltwater fish! Biota regal angels, majestic and emperor angels. Great mandarins and ...
05/03/2026

We got some fantastic captive bred saltwater fish! Biota regal angels, majestic and emperor angels. Great mandarins and my favorite stubby clowns! Come check em out before they go!

We got a whole rainbow of rainbow of rainbow fish in the shop! Come check out our wide variety of fresh and saltwater fi...
04/26/2026

We got a whole rainbow of rainbow of rainbow fish in the shop! Come check out our wide variety of fresh and saltwater fish!

Some great new selection and some healthy inverts!
04/19/2026

Some great new selection and some healthy inverts!

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

Alerts

Be the first to know and let us send you an email when The Ultimate Aquarium posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Shortcuts

Share

Category