One of the things I do is move tanks. Someone calls me that is buying a previously owned tank and they need help breaking it down and re-setting it back up in their home or office.
It can be super easy, or extremely exhausting. Generally I am moving about one tank a week. Sometimes 3, but that's a rarity.
Once I went into a tattoo parlor to break-down a tank. There were cockroaches in the stand...live ones. This was one of the worst I've ever encountered. Had someone contact me to move it for him. He had found the tank himself, not always a good thing, and paid for it before he told me all about it. I would have told him not to buy it. It was a trashed unit, not cared for, completely overpriced. But, my client didn't know any better. I was up til about 3 am that time re-plumbing and cleaning, and chasing bugs. But, it turned out okay, not perfect. Work with what I got.
Did a tear down of a 240 a couple of years ago. Found the guy on Craigslist, turned out we knew each other from back in the day! Came with some great fish, live rock, corals. And, then he gave up another cube tank with Halides...just because.
When I do a tank move or tear-down, depending upon how fast it's going back up, I save all the water. When you start an aquarium from scratch, you have to cycle your water. When you are moving one, try to save the water as it's already cycled, or cultured. I have 5 gallon jugs galore so that I can save the water.
Also keep the sand. It's got the biologicals in it too.
The live rock should be kept wet, but it can stay out of water for many hours and not have to be re-cured.
The fish? Make sure to have a pump and large barrel with you so that the fish can be kept in the barrel with the pump going while you are finishing the tear-down and starting the set-up.
The corals...need to be gentle with those. Some may be extremely fragile. Others can just plop right into a holding bin.
Almost every time I do a move, it takes longer than anticipated. Because I want the people that hire me to have the best, I usually do some plumbing, or cleaning, or re-vamping or some sort that they wouldn't have known to do themselves to have an optimum tank. I painted the back of a wave tank for someone that hired me to do a move this week. Wasn't done, needed to be done, so it was done!
Once we are all packed up from the tear-down, I drive to the new location with everything in the back of my truck. And then, go in reverse.
The aqua-scaping...I really enjoy this. The tank is set back up. The plumbing is tuned. The sand is in. Water is going in, and, I get to stack the live-rock. Making the right ledges for corals and the right tunnels and caves for fish is imperative to a healthy reef tank. Place the corals based upon light needs and flow needs.
If you want to do it yourself, it's not that horrible. I just have done so many that I have it down to practically a science, bugs and all.
Then, all done, your tank is up and running in your home or office!