Originally Posted by Shane87
as for the sand you have to stir it up and then the debris lays on top because its lighter and you hold the syphon hose about an inch away from the substrate and it picks it up .
Do not do this. Last thing you want to do in marine tank is stir up your sand bed too much. Depending on depth and age of sand bed and if you have any sand sifters you could nuke your tank.
If you have a shallow sand bed just use a standard gravel vac and put it in the sand directly. Pinch the tubing off before sand enters the tubing to prevent sucking up the sand.
If you have a deep sand bed some say don't touch it at all and others say vac small sections at a time on different days or weeks.
What are you using to test your parameters?