ok so i was talking to a lady yesterday who has an interesting setup, she has a uth with a 12x12 ceramic tile on top to diffuse the hotspot created by the uth, then a blanket as the substrate. the reason i ask is that she runs this uth w/o a t-stat or rheostat! it is used a 6ft RTB but i was thinking about using it for my juvi bp. is this safe?