You might try pushing a 30+ feet of eletric line #12 (stiff but still flexible) through the hose. At one end of the electric line strip about 1 1/2 inches to expose the 3 wires. Cut off the bare ground and 1 other wire. Use the 3rd wire to attach to the lope on the end of your tube brush. Twist it tightly to secure it as the stiff electric wire will hold it. Run water into the tube and you can push and pull this wire/cleaning brush back and forth as much as you need to clean the tube. Hot water and aquarium salt help the process. I use a 6 foot piece of electric wire to clean the hoses on my Rena XP2 and it works very well. Quick and easy!