Hey Beverly...
You may want to try visiting Jack at the fish pond. It is an edmonton home business but he is in the yellow pages.
I was there one time while he was making a special cold water tank that had insulation on 3 sides and he had gutted an old fridge and was using the cooling system from this to cool it. It looked realy "cool"
If you can pull this off I think it would be amazing, I have done some diving off of Port Hardy and the life is incredible. There is waaaaay more life in cold water than in warm water.
best of luck
Joel