I have been planning the move for a while. My refugium/sump is not changing just the tank size is going up 40liters (same tank i have but half again taller). My migration plan is to have my new tank next to my old tank (it's a big cabinet), cut power, move rock to new tank, capture my only fish a small damsel and keep it somewhere, drain old tank (i have 100 litres of 4 large containers).. once old tank is drained remove it, slide over new tank, fill new tank, add 40 litres of pre-mixed water from the day before to bring the volume up, hook up my refugium/sump to the new tank, power on, do some testing, etc. I am thinking my rock could be exposed out of water while the new tank is being filled, how long is this acceptable for if at all? Thanks!