The invention relates to a chip (1), in particular for coming into contact with and/or having an effect on animal food or aquarium water. The chip (1) comprises a fixing device (10) for fixing the chip (1) on a target object, and a receiving space (20), in which an application agent (30) is housed. The fixing device (10) comprises an adhesion or gluing surface. The application agent (30) comprises at least one of the following: at least one vitalisation agent, at least one nutritional supplement, at least one crystal, at least one mineral, in particular at least one quartz.
