As part of putting my first aquarium together, I bought the 25-foot Python for water changes and added a 10-foot extension plus I got a bigger 24" vacuum tube since my tank is 20" deep. I had to do a couple water changes with a short siphon and a bucket before the Python arrived, so I am definitely appreciating the added convenience that it brings. However, it doesn't vacuum up the big stuff! The stuff will go up into the tube a little ways, but then it swirls around and eventually falls back out. I read up online and saw people recommending a shorter siphon because it generates more suction. So last night I pulled back out my original siphon (the vacuum tube part is no more than 12", probably less, and the regular tube is maybe 4 or 5 feet). It seemed to work better, but there was still a lot of stuff that would only go up a little bit, then swirl and fall back out. I don't know if it matters, but I have sand substrate rather than gravel. I have to be a little careful not to suck up the sand, so I might have conflicting goals that are working against each other (vacuum the gunk but not the sand). Are there any tips or tricks to make these siphons suction better? I'd love to only use my Python but not real confident in its suction at this point (it is still worth it just for refilling the tank, though).