Adding tap water to your fish’s tank without the proper treatment can leave them rather green around the gills! Tap Water Safe from Aquarian is here to help you keep your fish happy and healthy! Most tap water contains chlorine which damages your finned friend’s delicate skin and gills, so it is important to use a water conditioner when setting up your new fish tank and with every water change. Good for the shoal!,Adding tap water to your fish’s tank without the proper treatment can leave them rather green