I have a 175 gallon stock tank we used to use for our horse, and I re-purposed it for a brooder when my chicks were small. They've now outgrown that and it's back outside. Can I clean it out and use it to collect rain water for the chickens? How would I keep mosquitos out of it? Screen over the top? Our coop is a good haul from our house, so it would save me from hauling quite a bit of water this summer if I could rig something up out there.