No problem! I've moved tanks many times, even a stocked 40br 60 miles with no issues and this 20gal was easy peasy.
You'll want lots of buckets (I used probably 6 total for this move. This is where keeping salt buckets comes in real handy because they are air/water tight and once sealed the water won't be able to slosh out while you're on the road), a couple of towels, and some freshly mixed saltwater. Tubing to siphon, portable aerators for the bucket(s) with the fish.. and I'm sure I'll think of some other things.
The easiest method I've found is to separate the fish into one or two buckets, depending on how many and how aggressive they are. Coral frags in another, usually a wider/shorter bucket, and inverts can go in as well if you don't want to fill a bucket just for them. For the rocks, I like to put the foundation rocks at the bottom, then the rocks with corals attached to them on top, with foundation rocks on either side to support them. If you look at the pics in my previous post, you'll see that large middle rock.. I had two foundation rocks, one on each side, to keep it steady so the SPS frags wouldn't hit the sides of the bucket. It worked out really well because nothing had moved!
So, I started by pushing the light aside and turning off all the other equipment. I siphoned a little bit of water into 3 of the buckets to start off with. The clownfish were easy to catch, so those came out first and were put into the bucket with the portable aerator. The royal gramma was hiding and was actually one of the last things out of the tank, but we'll get there!
I then pulled all the loose corals out and placed them into a second bucket, as well as the cuc. Now that the main fish were out, I siphoned more water out into the buckets until the tank was around 3/4 empty. I then started to carefully move rocks around to get at the ones without corals. (Careful so not to damage the corals, but also to not stir up too much of the sand.) Those went into the bottoms of two buckets, then as I described before, the rocks with corals attached went on top with others to secure them in place. Once I got to the last rocks, the royal gramma was skirting along the bottom and was easy to catch, haha. I think I put him in one of the rock buckets just so he wouldn't terrorize the clowns.
By this time, the last 1/4 of water was pretty nasty looking, so I siphoned this off, with a lot of the detritus, and disposed of it. This is why you will need fresh saltwater mixed and ready! I left the sand in the tank because it wasn't too heavy for two of us to move. If your sand is old, you can dispose of it and replace it with fresh sand at the new location.
Now you have to take the tank and its equipment apart, load the stand and everything into the vehicle, then the buckets, and you're good to go! The tighter you pack things into the vehicle, the less sloshing and moving will happen. Wrapping a towel around the tank will help prevent scratches.
Ummm, yeah, I think that's it. When you get to the new place, do the exact same thing, but in reverse. :tongue: