dont do it yet because u have to make sure that the rack doesnt have holes in it where your BP mite poke its head up and get burned by the heating pad on top of him yet under another BP.. like if you slide out the drawer/tub also the bottom of those things have groves making it a Pain to clean or stick undertank heaters.. i dont know if that makes sense pm me and i can explain it a little better also.. yes you still need a hide and water bowl temp gun humidity gauges ( forget what they r called) and if your building a rack system u might want to invest in a thermostat so everything is taken care of as far as temps go...