API Doc Wellfish's Hand Held Algae Pad for Acrylic Aquariums Algae Pad - Acrylic
API's Hand Held Algae Pad is a indestructible cleaning pad made to reach every nook, cranny, corner, and anywhere else algae may be hiding in your aquarium. For acrylic aquariums only.
If aquarium gravel is picked up on pad rinse before use. Gravel will scratch acrylic surfaces. Do not use extreme pressure.