Assuming the panel isn't going to be very far over the tank you won't need a very big circulation pump. They make solar powered pumps with a small solar panel for not huge money.
You can make a solar water heater yourself, get a 4x8 sheet of plywood or waferboard, paint it black (coat with fiberglass resin first and it'll last a long time) then put a big coil of black plastic pipe onto it. To secure the pipe drill holes through the board and zip tie it down. Its not the most efficient heater but much less money than the alternatives. If you make it level with the tank and can put the board mostly level you could even have it thermosyphon and not need a pump...
The worry of course is that a small leak of anti-freeze into the water will kill whatever is drinking it.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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