i want to emty my 75 gallon to take out all the gravel to have a bare bottom or lightly sand covered tank, however, i have a 10'' jardini, 10'' ornate birchir,2 4'' knives, 2 4'' parrots,2 7'' plecos and a 3'' black nasty. can i put these in a 20 gallon tub for about 2-3 hours. i have 3 tubs i can use, each 20 gallons.
