The whale tank is the home of Craig's Whale, one of his many pets on his show. The whale tank is a recurring joke in Wheezy's videos.
The tank was located in the middle of the bedroom floor, but was moved to the dining room since Craig moved into the new apartment. The tank is usually covered by a whale tank cover (which looks identical to the rest of his floor). Occasionally the whale tank cover breaks and Wheezy falls in and gets wet, having to swim across the tank to get back to his chair.
Wheezy's Whale eats bacon bits. Also, Stoner Michael Phelps hangs out in the whale tank.