Always add vitamins and electrolytes to water for newly hatched chicks. If they don't receive enough vitamin E in the first 8 weeks, or so, their brains may not develop properly; they may exhibit symptoms of encephalomalacia, a.k.a. "crazy chick disease," which looks remarkably like epilepsy.
One of my chicks contracted this issue at about 7 weeks; he had a slightly tilted head from about 3 day old. He seems much better after a couple of weeks of the powdered vitamins in his water; I haven't noticed a seizure in several days.
From The Chicken Health Handbook: