I have a question on how to clean smaller tanks. The tank in question is my 2 gal betta tank (1 male betta & 3 common snails) I don't think I can use the gravel vacuum I use for my 20 gal tank since it would remove water too fast, but I do not have a smaller gravel vacuum, could I just use normal air tubing, or is it ok to use the large gavel vacuum? The gravel vacuum has about a 2.5 in diameter on the large suction area.