Does anyone have a good knowledge of aquarium chillers. I was looking at a chiller that was 1/10 horse which it states is rated for an 80 gal. tank. I have a 90 gal tank but with all my rock I don't have 90 gallons of water I have maybe only 70 gals. Would this one work. When they say 80 gals. do they mean a tank with only water in it. Thanks for any help