If you've got a reef tank, I don't see any feasible ways (read, not $$$$$) to use TECs

I would be wary of even using anodized aluminum in the case of inverts in the tank.
You could find a decent compressor setup though for about half of what a good quality chiller for reef tanks cost if your patient, especially if you know anyone that does HVAC work.
(FYI - I have cichlid tanks, one for my Tanganikans and one for my Malawis - the true saltwater/reef tank route was just too much $ and PITA for my blood, lol)