Hundreds of tropical sea animals swim around below their former home, the New England Aquarium’s Giant Ocean Tank, which is being remade.

The tank is being rebuilt as part of the aquarium’s $17 million nine-month renovation.

Michael Weatherwax, Turner Construction project manager for the makeover, in “the attic” above the top of the tank.

Workers are still removing the old tank’s 60 panels, each of which weighs anywhere from 600 to 1,500 pounds and is made of four layers of glass.

Before the tank is rebuilt, some of the concrete around the current windows will be cut away, improving the kids’-eye view.

Workers cart off a section of the old glass tank; on a good day, five are removed. The panels will be replaced with 52 clearer-than-glass acrylic panes.

It took about 24 hours over two days to drain the tank so its 800 animals could be moved safely and comfortably. (The rebuilt tank will house about 1,500.) Now scaffolding lines the walls and surrounds the base of the coral reef sculpture that was built for the tank in 1984. The old “corals” are being replaced along with the glass.

The aquarium’s 2½-year-old Animal Care Center in Quincy has holding tanks for the new specimens destined for the tank, including this blacknose shark.

Elsewhere in Quincy are tanks for turtles the aquarium has rescued and quarantine tanks for sick fish and animals.

These all used to be tucked into nooks and crannies at the aquarium in Boston. Some of those spaces have been given over to new exhibits.

Where are the penguins during construction?

The Little Blues are still on display in Boston. But the larger flocks of Rockhoppers and Africans (in foreground) are spending the next months in a pool at the Quincy facility. Webb Chappell is a freelance photographer in Newton. Michael Fitzgerald is a freelance writer in Cambridge. Send comments to magazine@globe.com.