Hmm, interesting! From what I've read, at the beginning, the only thing I notice that may be causing your problem is Nature's Best Feed. It seems like you're doing everything else right. I incubate eggs year-round and have never had that problem. Once the eggs hatch, they go in a clear plastic container, like yours, inside the house for about 2-3 days, with a heat lamp, that I keep at about 100 degrees at first. I don't use Electrolytes in the water. The feed I buy is just regular Medicated Chick Starter, from my feed store. Then as they get older, I go to just regular chick starter. After the 3 days they go outside to a bigger plastic container/brooder and they stay in there for about 1 1/2 weeks before I move them into an enclosed pen, inside my enclosed chicken run. This time of year especially with this heat, they don't need a heat lamp. Easy peasy! Hope things work out for you but if you need any more info, you know where to find me.