Gave them a couple grass plugs(with dirt) switched the food to the medicated Purina, but im still seeing a lil build up under vents. Dont think im to hot, or to cold..The chics are laying around ceramic heater, but they do get up and wonder off to the other side to drink/eat etc. No stress that im aware of..Without putting them in a bator type brooder where its pretty much closed off from outside air, theres no way to maintain 1 specific temp in the whole brooder. Im starting to think a lil pasty butt is just part of the process? Will update 2morrow to see if gets better..Its not really bad, i just dont want it to get bad..