lookin at old posts...
What about drillin a pair of holes in the side of an old fridge, and patching a line from near bottom of your tank, into the fridge and through a few horizontal loops of copper pipe, then back out the fridge and into the tank near the top.
once primed, the water should circulate on its own as the warm water is drawn in, cools, and drops into the lower port on your tank.
make the heat transfer more efficient by submerging the coiils in a closed 5gal water bucket.
keep them eels out with a nylon screen at the base.
could even use quick release hose taps at each of the fridge and tank ports.
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