bruce, then I'll put a strip of duct tape from top to bottom on one side, and paint the outside white. When dry, I'll remove the tape. That should give me a view window to see how full they are, and if there's any algae inside. Once done, I intend to use them for water. At least one will go out by the coop(s). I can use the water from it, and add new as needed, so it gets fresh water on a steady basis. If anything happens to the pump, or things go awry during hurricane season, or whatever, that gives me 275 gallons of water for the chickens. I haven't decided on the other one. I'm thinking of putting it at the far end of the front porch, but it may end up out by the coop too.