I currently have a 120 gallon tank withabout 10 fish in it with overflow box, sump, etc! Someone gave me a 120 drilled tank that I want to switch out with my current tank. My question is: will this many fish be ok in a 29 gallon? And if so, How much time would I have to do the swap? Next question: if all my rock want fit in the 29 (which I'm sure it want) how can I keep it alive tilim through with the move?