I think you are right cabezon.
Cterzich. It seems like everyone suggests using a python. For some reason I had trouble with it. I think it was because I was just starting and didn't know what I was doing. Then again, I've never heard anyone say they had trouble using theirs. So, I took it back and just got a plain old siphon and didn't have any trouble with that one. I might decide to try a python again now that I have a little experience under my belt. But you definitely need something to clean the bottom of your tank and to help with water changes. (unless you have a small tank and plan to do 100% w/c's.)