When I ordered my t8 i ordered the flexwatt and divider with slidding glass doors with a lock.. Plan on having 2 adult Bps in it so each one gets a 2x2x1 area. I have a RBI 40w heat panel in each side and use cryon led under cabinet lighting for them they hold temp good I still have to run a space heater in the room because temps can get as low as 58 degrees and that day it got down to 73 on my cooler side so that same day I went to get a space heater but doesn't help it's been in the negatives..