Every 3 hours, the water tank decreases by 10 gallons. So in 24 hours, the water tank decreases by 10*8 = <<10*8=80>>80 gallons.
If after 24 hours the water tank decreases by 80 gallons, after 6 days, it decreases by 80*6 = <<80*6=480>>480 gallons. Answer: \boxed{480}.
A water tank decreases by 10 gallons every 3 hours every day. What is the total change in the amount of water in the tank after 6 days
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