Do you guys really suck on the syphon or is that a joke?? If i tried that it would be a disaster! yuck. When I first got my syphon I couldn't figure it out for the life of me, despite following the directions on the back of the package (it was a regular syphon with no pump). I went to the LFS and a nice guy showed me a really easy, no mess way, (different from the package instructions):
1. put the hose part in a bucket and then take the larger tube and put it upright in the tank, below the water level.
2. let the water flood into the tube.
3. Once the tube part is almost full of water lift it up (still holding upright) and the water will drain down the hose into the bucket.
4. BEFORE the large tube is almost empty put it back in tank holding it perfectly UPRIGHT.
5. Let water flood back into the tube, once its full push it all the way into the tank (still upright) and then flip it upside down (with the opening towards your gravel).
6. It should be suctioning now. If not repeat filling the large tube with water. The important thing is to keep it upright until the very end.
Its kind of difficult to decribe here, so if you have problems i would suggest to your LFS and ask someone to show you.