The penguin tank at California Academy of Sciences is tucked at the far end of African Hall.
The first half of Tusher African Hall moves through human evolution, specimens, and African animal scenes. At the end, a group of African penguins swims in a 25,000-gallon tank. That turn is interesting: one gallery brings the human story to an endangered seabird.
I checked the official current-individual pages and did not see the Tusker mentioned in the spec. So this page does not write as if that bird is still there; it focuses on the current colony, daily feeding, and breeding program.

What to see
The official Meet Our African Penguins page introduces individuals by band color, and feeding times are daily at 10:30 and 15:00. This is not a large show. It feels more like a biologist feeding fish while helping visitors see individual differences.
From 2022 to 2024, Cal Academy welcomed multiple African penguin chicks. Official news places that in the context of the AZA Species Survival Plan: maintaining genetic diversity in a human-care population, while also linking to SANCCOB’s rescue work in South Africa.
To understand this kind of zoo conservation language, the Georgia Aquarium encounter angle makes a useful next read.
For the same species in an open zoo coastal habitat, continue to San Diego Zoo.

How to plan it
Cal Academy is a full science museum, not a single aquarium. Penguins, rainforest, planetarium, and natural history galleries can consume time; half a day is more realistic.
If you are coming only for penguins, check the day’s program calendar. Feeding talks are short. Miss them and you are left with general viewing.
In San Francisco, it fits naturally with Golden Gate Park. Cold weather is fine; the exhibit is indoors.

Penchan Says
The best moment here is when the museum suddenly becomes quiet.
You walk past bones, specimens, and evolution diagrams, then stop in front of an African penguin swallowing a fish. Conservation is not a slogan on a wall. It is right behind the glass.
References
FAQ
Where are the penguins at California Academy of Sciences?
The African penguin tank is at the far end of Tusher African Hall, in a 25,000-gallon exhibit.
When are the Cal Academy penguin feedings?
The official Meet Our African Penguins page lists daily feeding times at 10:30 and 15:00.
Why does this page not say Tusker is still there?
The page follows the current official individual pages, where Tusker was not found, so it focuses on the current colony, feeding, and breeding program.