Also is it a good idea to remove my the while changing the water?
I;m not sure what that means, but as long as you don't stir up sand all over the place or dump the water right on a coral that doesn't like flow you should be okay. Really, I siphon the water out and pour the new water right on top of my leather in the front, i figure it likes flow and after the water hits something the flow is lessened.
that's just me though. other people use siphons to get the water back into the tank as well.