depends on the size of tank.... maybe an hour?lizardfishman said:in other words. how long does it take to do a water change.
yeslizardfishman said:can you keep the water for a while in the garage if the power head stays running?
waylon said:I use two 5 gallon buckets and change 10 gallon 1 time a month.I have a 55 gallon tank.