Okay, well I think we've been taking everyone's opinions above our own and have made a strategic error. I hope you can make some suggestions for us.
We really dug the idea of having sand in the run. But in building the coop/run, we listened to everyone's worries about the heat and dryness in California summers (which is true) and put a full roof over the run to protect the little ladies. And it's true that they are not sun-worshippers after all. Even the rays of sun that reach the edge of the run don't thrill them for long, and they retreat into the cool coop. And it's rarely over 85 here in full sun.
What's happening is that the run stinks, because it's in the shade, and in the fog of the night, it gets damp. Also, we heard you folks talking about washing the sand, and forgot that ours wouldn't dry out unless we uncrusted it after washing and turned it for several days afterward. So then we got the moldy smell...but turning and turning and now it's gone.
I admit I have a sensitive nose, but these little darlings poop incessantly. And trying to scoop it, with a horsey rake thing - - well it just falls through - they are still only 4 mos old. So we shovel and waste a lot of sand, sometimes we try to sift it a bit.
Truthfully, we just ignore it for 2-3 days at a time and then buckle down and work on it.
What are we doing wrong (many things, I'm sure), and, do you think we should switch to hay after all? The coop/run are only about 15 feet from our patio!