I have a 30 gallon tank(36 inch long)I want to replace it with a 75 gallon tank (48 inch long).I need to put it in the same spot .I have 3 bala sharks and one spiney eel in it.Can i empty the 30g water into buckets, move the tank out of the way ,put the 75 gallon up use same water,filter and some gravel from 30g(Add new water).Should I put the fish in a bucket or keep them in the 30 with some of the water.Would the tank be cycled?My tank now has an UGF and a penguin biowheel 330.I hope you can understand this.