I am ready to thoroughly clean my tank for the first time. I have a couple of questions as I am new to the aquarium world. I plan on taking water from my tank and putting it and my fish into my old tank while I clean the first one. I am not sure how much water I should remove from the one I am cleaning and should I put back what I take out when I am done cleaning? Also, if I remove the gravel and rinse it off, will that make my tank start the cycling process again or will there be enough beneficial bacteria in the filter media? I am concerned about my tank having to cycle again. I have become quite attached to my little guys and do not want to harm them in any way. Any advice would be welcomed. Thank You