I'm told if I use one cup of sand from a cycled tank(per ten gallons) and use one third "dirty water"(from cycled tank) and a little used filter floss, that I can go ahead and trust my new 40 gallon tank will be cycled automatically. Reading the stickies here, that seems to almost be the case. Sticky saying water transferral close to useless. Just check levels on nitrites, ammonia, nitrates after a few days(instead of weeks)? Have three tanks I'd like to get into operation. Would you advise me if this is a gamble, foolish, or worth a shot?