I am using a 60 gallon pump the Whisper 60 here: http://www.tetra-fish.com/catalog/product.aspx?id=67

the tubing is the stuff they use for the pumps.. the standard tubing that fits the air pump, it's pretty small and flexible, I would say the outside diameter of the tubing is 1/4". It's standard aquarium air tubing. My seals are all good, I double checked that, and I put a big layer of hot glue all around the seals so that's fine I am sure. Plus I can feel air coming out of the tube that goes into the cage... it's not a very powerful blowing, but it certainly does blow out, and if you put your finger over the tube end you can hear the air backing up and then when you release your finger the air will come out much harder for a few seconds, sorta like the same thing as if you stop a hose from spraying and then release your hand, the water comes flying out much faster for a few seconds..

I just think that there isn't enough water evaporting into the air inside the bottle, as I said before the water level only went down about 2 inches in the 1-gallon bottle over a 5 day straight period of running 24/7... at this rate, I wouldn't have to fill the 1-gallon bottle up again probably not for another month or so.

Now in comparrision my room humidifier can suck through 2-gallons of water in one day, so I know that's much more efficient but I don't like the idea of blowing a room humdifider on my cage plus there is no way for that humid air to really get inside the cage from blowing on the outside of it..

as for my tubing hose lengths, I have about 1.5 feet of hose going from the air pump to the bottle, then from the bottle to the cage is probably about 4 feet long.