Chrispixx
Fish Crazy
I have 1 question though. I think your biggest concern should be about putting your fish into the uncycled 180 gallon. Have you thought about what your going to do cycling wise?
Good point, i would suggest using all the water from the 55 in the new tank. then just add new de-chlorinated water to it.
use the filtration too if it will work. also use the gravel, even thought it wont be enough for the 180 you can use it and just add to it.
this way maybe a cycle wont happen. this is what i did when i went from my 10 gallon to my 29 gallon and had no cycle. your just doing it on a much larger scale.
The floor supporting that big of a tank is a much bigger issue though.