I have 4 new baby chicks and I purchased the cozy coop heater for my brooder box. It was recommended to me as safer than heat lamps. I think it's ok, but the only way for them to get warm seems to be to pressed right against the surface. My question is, my chicks seem to want to go behind it. There's a small space between the back of the heater and the wall. I wonder if it's too cold back there and they can't easily find their way back to the warm surface. Anyone have issues with it?