API Freshwater Hardness GH & KH Test Kit Size:GH &KH test Kit These universal bulbs are ideal

These universal bulbs are ideal for freshwater aquariums and fit all compatible electronic ballasts

Water intake/output connections

and nearly indestructible

Size 20: Fits Aqueon 20" LED Fixtures

Dimensions listed show (strap width x body size)

API Freshwater Hardness GH & KH Test Kit Size:GH &KH test Kit These universal bulbs are idealThe API Freshwater Hardness GH and KH Test Kit tests tap water and freshwater aquariums for general hardness (GH) and carbonate hardness (KH). Keeping these factors properly balanced creates a more healthy, natural environment for your freshwater aquarium fish. General and carbonate hardness test kit Monitor GH and KH to create a more natural habitat For freshwater aquariums The Freshwater Hardness GH and KH Test Kit helps detect stress on fish caused