ADAPTIL is completely harmless to fish.
However, if you are using an ADAPTIL Calm Diffuser, as for any diffuser device, we recommend plugging the diffuser in a room without an aquarium as a precautionary measure.
If your dog spends most of their time in the room where the aquarium is located, we recommend that you use the socket furthest away from the aquarium. This precautionary measure is intended to prevent the oily carrier from settling on the surface of the water. The components themselves are not classified as environmentally hazardous.