perfect_pREfect sorry to derail just had to correct him. by the way you dont want to add the hot water because it will spike the temp, you want to keep it constant, if you are going to be keeping them in the tubs for only a couple of hours dont use any heat, the water will hold its temp pretty well so long as the tubs are full. when you get the tank set and at the same temp as the water in there tubs just put them in and transfer the filters. also you wont need airators so long as you have the filters going. i transported a silver arowana for 8 hours in my jeep from st louis to northern iowa with no air or heat, water held its temp and no lack of oxygen.