I have 3, 3-4 week old stripey Easter eggers and 1 has had diarrha for 4 days and its not getting better. I keep them in a clean bin with the heat lamp,I change their water in the morning and at night,they have antibiotics in the water,they eat alot of chick starter. their bedding is the pine shavings, they have a perch too. I did notice 1 chick is chasing the other 2 around all the time, but i dont think that could cause it. I dont know what to do,this is my 1st time raising chicks.