As reccomended by my breeder I have been using Vitamins & Electrolytes Plus by Agrilabs. It's fabulous tons of great things for my girls. I've been adding this to my girls water after I had two die from Meraks (I of course know this won't help any of them survive Meraks, but I wanted to make sure they can be the healthiest they can be). I noticed tonight when cleaning the waterers that the V & E plus has effected the metal container, in that there is a discoloring of the metal at the top. I plan to call Agrilabs tomorrow but wondered if anyone had experience with this. Also does anyone feel strongly that you should or should not add vitamins & electrolytes to their diet? some facts... I have 10 fabulous girls, they live in a hen house of 36 sq feet, a covered run of 64 sq feet and an enclosed but only covered by netting run with sod and sand of 112 sq feet. They get organic purina pellets, sunflowers, oyster shell, daily handful of scratch, treats of grapes/greens/etc. Ages from 18 week to 26 weeks. Only one laying so far.