We are changing our coop a bit and I want the roosting boards lowered a little. I thought I'd read the height is good between 18-24 inches from ground. True? Also if I have one 24" and one in front of that at 18"... what space is recommended between those two? Would they just hop from back roost to front one and then to the ground? I ask as we previously had two roosts angled next to each other in an L shape, so they were all essentially on same level. We have 4 hens and 1 rooster now. Thanks in advance!