I had mine in a 350 with a 3 in sand bed and it cleaned the sand out in a matter of 2 months... So for a year your gonna need a huuuuuge amount of sand, it lives in a 3500 gallon tank with like 6 inches of sand now and it's getting big, don't worry your trigger will one day decide to kill them all, just a matter of time give them a year or so.... You seemlike your dead set on getting one no matter what advice your given, so if you want to do it best bet is to add like 4 inches of sand to your tank and it will be ok for a few months, but forget target feeding it