Responding to the pectoral fin comments, it's unlikely that a humpback whale would be left with barnacles in a captive environment.

Since it's an unfixable bug, can you add bumps to the pectoral fins of humpback whales?

a whale of a time

The swimming bug is known and happens with all cetaceans upon placement. No idea why, but I suspect it to be a base game issue with containers on the Megatank. Noted for humpback whale texture

Bowhead Whale and Humpback whale have a common bug, when they are placed inside the tank, they will swim towards the corners of the tank, then go through the tank and disappear, then appear in the central area of the tank. And the color of the Humpback whale should be darker. Its pectoral fins are too smooth. In reality, the pectoral fins of the Humpback whale are covered with barnacles.