MyFishFinder.com Just like iceshanty but warmer
Hey grutngrin - that looks pretty simple and "sweet". If your days (outside) are mostly above 0 deg. F. I don't think you'll have many freeze-up problems. How far away is the creek? Is it "uphill"? If you could get to the creek at an elevation above your tank you could always run a piece of plastic pipe 1/2 or 3/4", start a siphon and circulate the water from the creek like that. No freeze-ups then.
Looks like it will work. How about wrapping it with insulation if you are worried about freezing.
seperate the crayfish from the shiners!!!!! or you will be
Do you have a filter on the tank? If so check the filter and you need to change the water once a week. Make sure they are getting enough oxygen too. Drain half out and refill. Don't drain it all because the fish will not get aclimated to the new water and die on you. Also, what are you feeding them? If you keep the water cold you won't have to feed them, and the water will be clearer, and you won't have to change the water as much.