I read the sticky on substrate and searched the forums but I still have a question. I would like to eventually try sand in one of my tanks, but how do you clean the tank. I am used to a gravel vac is there a way to clean it without losing all your sand? I do weekly water changes so I'm not worried about gas pockets but I would need to have it more than a half inch thick. Has anyone had any problems with thicker sand? Thanks for any suggestions!