I have recently changed from gravel to sand and when I would clean my tank out when gravel was in it I would just stick the siphon down in the gravel. My question is do I need to do this with the sand or do I just Hoover over the top of the sand and collect any dirt that has collected on there. Also there are lots of live plants in my tank now so can I clean it without disrupting them or do I need to uproot them from Tom