Having problems getting your water to test right? Having an ammonia spike or just trying to cycle your tank? I would HIGHLY reccommend using NUTRI SEAWATER. You can buy it at your lfs. It has natural, live bacteria that you CANNOT get using salt and water mixes. It actually comes from the sea. Its also amazing for pwc. I use it and my lfs guy told me my water could NOT be any better! Please try it, you cannot go wrong :]