One tank is over 400 litres and is sitting on a large walnut cabinet - so that will have to be emptied to be able to move it and the cabinet, another is on a rimu base and will be far to heavy to lift both base and tank (but could lift tank if all substrate is removed and I do plan to do that over Summer - swap it out for white sand, so might do it then), so maybe that one won't be too much of a problem. Actually thinking about it - it's only those 2 that will be the problem so may not be as bad as I realise.
I'll talk to the LL and we'll come up with a plan of action
...and then once the new carpet is laid, I'll be terrified every time I need to fuss about with the tanks :tears: