Cambridge Aquatics Rainbow Reef Ornaments. Our Cambridge Aquatics Rainbow Reef Ornaments add a big splash of color and style to any tank. Bold, bright coral shapes made of durable, fade resistant polyresin. Made for use in fresh and saltwater aquariums. Available in: Aqua Marine 8 1/2 inches x 4 1/2 inches x 5 inches; Deep Sea Purple 12 inches x 5 1/2 inches x 6 inches; Salmon Pink 4 1/2 inches x 4 1/2 inches x 3 1/2 inches; Turtle Green 9 inches x 8 inches x 5 1/2 inches. This listing is for the size, color and style in the listing title.