SeaView seals your background to your aquarium, eliminating the refraction of light behind the glass resulting in a flawless, illuminated, 3D view of your background from every angle. Brilliant results that last for the life of your aquarium. SeaView's non-toxic formula is unaffected by salt creep and prevents condensation. Works on acrylic or glass aquariums. One tube of SeaView treats up to a 75 gallon tank.