The food for bigger catfish: can be used as a bottom or attaching tablet. sera catfish tabs XXL is the staple food made of big bottom tablets for bigger catfish (E.G. Plecos) and other bottom fish. The tabs can also be attached to the aquarium Glass. This kind of Feeding provides fascinating opportunities to observe different ornamental fish species. The high amount of spirulina (21%) with many Mineral and vital substances supports digestion, color development and health. Since the tabs keep their shape for a long time they allow eating slowly without polluting the water.