AquaClear 30 Ammonia Remover is ideal for new or heavily populated freshwater aquariums. Controlling ammonia levels for fish, It removes and controls harmful ammonia and nitrite, creating a healthy aquatic environ
Equilateral Prism, Material: Acrylic, Useful for experiments in Optics, Light Refraction and Wavelengths, Will create a rainbow (even in room light) by using the simple led light of a smart phone, User will need to create a small slit in a black piece of paper, Size: 1in Hx1in W