Here's a thought for ya, as a different method of getting water into your tank:
Get a water pump, Mag 3....what ever pump you want to use, so long as pumps waters. (I use a Mag 3 myself) Most of the pumps I have seen use 1/2in
PVC pipe for fittings and such. I have cut a 5ft, 3 ft, and 2 ft section of solid pipe. As well I have a bunch of fittings (35 degree bends, 90 degree bends, short pieces of pipe)
Basically, what I do is put the bucket of water as close as I can get to the tank, then build a temporary pvc pipe from the bucket to the tank. I can pump 5 gallons of water in a minute or so.
Works like a charm, and you can get pumps fairly cheaply, if you don't have one already.