well its like this. 125 gallon tank . 13 6 inch piranha nitrates go off the chart. 60 gallon water change every other day got plants to. to do this with 5 gallon buckets is not going to happen. so i do this. hook up 25 foot pool vacuum hose inch and a half to fx5 and 60 gallons out the door in 4 minutes. fill back up with 5/8 garden hose hooked up to shower takes about 10 minutes.