Nothing actually haha they have just stayed at those levels throughout the grow? my tap water is a bit wierd as i live in an extremely old house so the waters a bit.... organic. sometimes a bit orange from rust but i always let it run until it clears up, so just tap water and mollasses? i test them usually once every few days and haven't had any problems yet.

Also added another 400w HPS on the side with a big white satellite style reflector :jointsmile:

Peace :hippy: