For fish that graze on seaweed (algae) to thrive in your aquarium, food needs to be readily available, allowing them to pick at it, little by little, over an extended period of time.
Ocean Nutritions Feeding Frenzy Seaweed Clips hold seaweed underwater. They have a long and strong gripping surface for securely holding seaweed and a suction cup that allows them to easily be attached to the inside surface of acrylic or glass aquariums.

Product Features:
Feeding accessory that firmly holds dried seaweed in place underwater
Waterproof with suction cup for in-tank feeding
For use with marine or freshwater fish
Perfect for vacation feeding
For use with all algae grazing fish, including tangs, rabbitfish, marine angelfish, wrasses, damsels, and more