So I'm thinking about going from a 30 to a 40G (I'd go larger, but the stand would only take the 40). Any advice on moving a tank? I've got a second tank that I use as a QT or in emergency, so I'm thinking fish go in there, move the old tank & put in the new, move the fish to the new home. simple. My big question is: how thorough should I be in cleaning, especially gravel? I imagine that in taking gravel out, I'll stir up quite the mess. - I'll probably add some new gravel in too.