Hi! I have a question about the putting sand in the tanks for the poly's. How do you go about cleaning it? I have smaller gravel in my tank, so I use a gravel vac, but a lot of the time I suck out gravel, so I have to hold the hose higher than I normally would so there is less suction. Is that how you would clean the sand? Or is there some special way that I just don't know of/thought of. Thanks! Sorry if this has been asked a million and one times already.