Gelatinous Tubes

A domesticated variant of the gelatinous cube selectively bred to have a cylindrical shape. They're commonly raised and trained by plumbers to clear severe clogs and blockages. Fancy varieties are kept as pets in elaborate glass pipe terrariums.

Sometimes they escape down drains into the sewers where they grow unchecked to fit inside the larger diameter pipes. Feral gelatinous tubes are a major source of problems in cities causing damage to infrastructure, flooding, and rat infestations as the rodents flee to the surface to escape.