Sera spirulina tabs are an vegetation based food for mainly herbivorous fish and invertebrates in fresh and marine water. The carefully manufactured tablets sink to the bottom or may be attached to the glass by slight finger pressure. This allows for watching shy fish while they are eating. The particularly high amount of spirulina algae (27%) supports healthy digestion and liveliness. The balanced diet supports healthy development, splendid appearance as well as natural behavior of the animals.