The Tank is a Tier 12 Pet obtainable through a Tier 12 Egg. It's rarity is 2.5 stars.
It can be made golden. A Gold Tank's base stats are 10572 Gold Collection and 1425 Agility, and the maximum stats are 11112 Gold Collection and 1965 Agility.
Its rainbow version starts off with 5 times the normal stats with 17620 Coin Collection and 2375 Agility.
Gold Tank is the only gold pet that is not entirely golden.