Fish Tank Siphon

http://www.petforumz.com/Gravel-Siphon-Recommendations-ftopict46270.html (Gravel Siphon Recommendations?)
I started a tank a few months ago, and although I've been doing my best to keep it clean, the black and white gravel is starting to turn brownish-orange with debris. I've got a gravel siphon thin..
« Donald Roeber: I highly recommend the Python »
« Donald Roeber: How often do you gravel vac? It should work just fine. How deep is your gravel? »
« Ook: Gravel siphons come with different diameters of hose. I have two, and the large diameter hose syphon provides much more suction and.. »

http://www.petforumz.com/Water-Change-siphon-gravel-ftopict51568.html (Water Change Question - siphon gravel too?)
should I stir up the gravel each time I do a 1/3 change? or just occasionally to get the brown stuff out of there... Craig
« Craig: That depends on how thick the gravel is. Most people should vaccum the gravel trying to keep non-vaccum disturbance to a minimum. H.. »
« best thing is to put the siphon into the gravel - leave it there for a minute or 2 - then move it to another spot - don't stir up the grav.. »