Yes. Here is the plan guys, and actually, it's a pretty simple one with just a lot of labor. Bury a loop of copper underneath the surface and run water through it. This will allow the cold ground to chill the water running through it. Compared to how warm your tank is, think about how cold the water is coming out of your faucet. Same principal. We're burying 200 feet or so of 1" copper and then running water through it at a slow rate to let it chill. The end of this copper will have a connection to a titanium heat exchanger (which is nothing more than a loop of titanium that we can run this water though). This head exchanger will be set in the sump in a high flow area so that water will pour over it and be chilled when it comes in contact with it. The exhaust water of this heat exchanger will then dump into the sump of this closed copper loop system, and be circulated back underground to be chilled again. We really hope that this will save on the cost of chilling the tank.
Keep in mind, that even if this were a fish only system, putting this copper underground with all the solderjoints and connecting it right to the system would still not be an option because of the flux and solder required to join the pipes and elbows together.