I would suggest an undertank heater too, on one end, since you're using a tall tank.(better to have a low profile tank). Just be sure to heed the directions. I would also suggest a full spectrum florescent bulb of some kind (low UV). Providing a temperature gradient can be tricky in a tall tank. If you're using a basking light, it needs to be very low watt and highly focused. Watch it though! don't want to overheat the tank, and an undertank heater on one end give's them a choice so it's safer. A locking, secure screen top is a must. Don't let them fool you into thinking they can't get out. All lighting should be placed on top, or outside of the screen.