I recently purchased six Heavy Duty 300 lb lift capacity 4-head suction cup handles to move my 300g cube tank that weighed about 500 lbs. With two of these on one end, I was able to lift that end up myself (for a short period of time).
The difference was night and day when you can use your entire body to lift a heavy tank instead of using your fingertips to hold most of the weight.
If you are looking to move a heavy tank, I'm selling them for $30 each or you can just "borrow" all six on a weekly basis.
Pickup from Surrey or I can meet in Richmond.
PM if interested.
Thanks