I was ok with using 5 gal
buckets until I moved beyond a 50gal tank. I moved up to a 150gal, and the amount of buckets I would have had to carry was way too many.
I use a sump pump in a 5 gal
bucket. When I'm emptying out the dirty water, I vacuum into the bucket with the pump outlet going either to the sink or out the window to my garden. I just keep vacuuming while the sump keeps the bucket draining. Then when I'm ready to refill, I put the bucket in the sink with the right temp of water filling it, all the while the sump hose is filling into my tank. Hands free tank filling while I can make a cocktail and enjoy my clean tank!