PetSafe Spray Refills Style:Unscented Refill Cartridges Or you can hang it

Or you can hang it vertically on the aquarium glass

Reflective elements

Improves water quality

Small size Mealworms

PetSafe Spray Refills Style:Unscented Refill Cartridges Or you can hang it*Make sure you are ordering the proper refill for your Spray Control system. The PetSafe Spray Refill cartridges are easy to replace with no mess. Simply remove the empty cartridge and replace with the new one Compatible Collars The PetSafe Spray Refill Unscented is for use with the PetSafe Spray Bark and Training collars; it is NOT compatible with the PetSafe GentleSpray, Elite Big Dog and Little Dog Spray Bark Collars or Elite Big Dog and Little Dog