Also, in order to siphon the water out, you don't need to put your mouth on the tube. You just put the entire tube under the water, allow the air to go out. Then put your thumb over one of the ends to block water flow. Make sure the other end is still fully in the water. Lift the thumb end out of the water and release your thumb. Water will flow naturally for as long as the other end is still in the water.
If you have your tank next to a window, it is very easy to open the window & siphon directly outside. Then fill up with the water hose from outside (route it thru the window). Of course filling with water hose won't work if you live in a winter/cold/snowy climate, but in that case, you can just haul 10 gallons of clean water to the tank. 3 trips and you are done (easy!).
I use the python tube that other people here talked about for my 90-gallon tank & it works great. LOVE this!!!! I don't know what people did before python tubes...that thing was worth EVERY PENNY.




