We moved our 180 twice in a a matter of 6 months. Could think of much better things i would like to do
But here is how we did it. If you can try and dedicate a whole day to get it done. Buy lots of heaters and rubbermaids.I drained enough water into a few rubbermaids that would cover the fish enough but still be okay to carry it without getting water everywhere. The first time we didn't bag the corals and alot got stung so the second time it was easier to bag the corals and let them float in a rubber maid.Considering you have a short distance to go you can take them all over,get heaters and airstones going and can focus on getting rocks over in the same way. Just make sure they are submerged and heated and you have alot of time. I ended up getting the longest rubbermaid i could for the rocks. And it fit 180 pounds of rock in it no problem and about 50 gallons of water.Then we got the tank to the house and transfered as much water as we could. We used water jugs that we got for water coolers. You can get the caps for them at any water store. That way all the water doesn't come out. Alot of places if you tell them what you are doing will give them to you for free you just have to pay the deposit on them which you get back of course
Then get the Ro hooked up with a garden house so you can just run it directly into the tank...And if you managed to get 1/2 to 3/4 of the old water its just a big water change....Add salt mix,heat and then add your critters...lol
We weren't as lucky the second time as i know now my ro unit got damaged in the move and i just thought it was low pressure so it took 4 days to fill it up from 1/2...So my fish,corals,rock,and nems sat in rubbermaids for 5 days with no issues.
It is the most stressfull part of the move thats for sure. So if you have a whole day just dedicated to that it makes it much easier!!
Good Luck and i hope this gave you some ideas!!