Best to have 40g or so of new water pre mixed to add to after its set back up. Need lots of buckets, small pump and hoses, truck and a freind or two to help. Start early, it takes time.
" Without knowing details ".......Main thing is to use common sence to maintain tempatures...
1, shut it down and load lights and a equipment that you can remove first.
2, Put only enough tank water in a bucket for the Lion to swim upright and remove it first, use caution with that fish...I have never kept a Lion so I dont know the best way to catch it....cover with lid to keep it calm.
3, Bag or place all small corals that can be removed easy or not attached to large rocks in buckets/styrofoam coolers with tank water and try not to let them touch each other. Larger pcs. with corals in bucket by themselfs, ect.
4, Syphon/pump some tank water to garbage can and start removeing larger rocks....all rocks do not have to be totally submerged, place clean wet towels over the top.
5, Syphon/pump water out to bukets untill its easy to scoop the tang out, best to use a bowl or box, there spike can get traped in a net and damage it, use caution with the tang also, it can cut you. Place in a bucket with only enough water for it to swim upright. cover with lid or towel, ect.
6, Last 1 or 2 inches of water will be dirty and should discard. Leave enough water in the tank to keep all the sand wet. Leave the sand in the tank.
7, Remove the rest of equipment and load all, secure good and drive carefull....
Set Up
1, Place stand and tank and any equipment back and check for level and access, ect.
2, Pump in around 2 or three inches of tank water. It will be dirty from disturbing the sand and then that water should be syphoned/pumped back out and discarded.
3, Put in some more tank water and start placeing base rock securly down in the sand to the bottom of the tank so as it will not fall over.
4, Keep putting in tank water and the rest of the rock untill your ready to place in corals, then fill tank, may have to start useing new water about now to fill.
5, Hook up the rest of the equipment and and test run.....lights not needed yet
6, Start acclimateing the fish as you place the corals and make decore changes if you want, May have to remove some water to make room for smaller rocks and corals.
7, Put in fish and again use caution.
8, Do a water change with whatever new water you have left and start makeing new water for a change later, next day. Keep testing levels, may kick up some nitrates but should not start a cycle.
9, Add lights and enjoy.....Good Luck