Need to raise up ATO reservoir

So I'm setting up an ATO on my reef, and the height from where the pump would be in the bucket to the top of the tank is just inches shy of the max head height of the pump. I need some way to raise the bucket anywhere from 3 to 8 inches, as I'd prefer not to have to buy a new pump. Whatever I use has to be able to support around 40 pounds, is saltwater proof, and is not in the way. What I mean by the last point is that the bucket needs to be easily switched for a fresh one since my family will be taking care of the tank while I'm at school and they don't need the hassle. I was originally thinking of stacking the ATO bucket inside 2-3 other 5 gallon buckets, but those stick together easy – an example of what I mean by hassle. So does anyone have any ideas?