Guppycrunchers are seen in Tank 3 of Adventure Mode, Time Trial Mode, and Challenge Mode. Guppycrunchers eat small guppies. They give beetles to the player, which instead of falling down the tank, climbs up the walls of the tank. A beetle gives the player $150, and is also the food for beetlemunchers. The most effective way to take care and feed them is buy a baby guppy and drop food near the bottom of the tank to lure it since when a guppy is bought, they need to eat as soon as spawned so this technique is effective.
In Virtual Tank, a guppycruncher is sold in The Fish Emporium for 2,500 shells. A guppycruncher in Virtual Tank acts very much like a guppycruncher in other modes. A beetle it releases gives the player 7 shells.
- Guppycrunchers and Carnivores make similar sounds when they die. The other pair which shares the same manner are breeders and starcatchers (the highest pitched dying sound).
- In the game's files, the images with the Guppycruncher's sprites refer to them as "grubber". Strangely, the complete sprite sheet refers to them as "grubgrubber" instead.
- Due to its enormous jaws, it appears to be based on an antlion's larva.
- It is the equivalent of Destructor's missiles in Insaniquarium: Revenge of the Fish. They are fired by Rhubarb as Destructor.