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[dragon lady]

Spot light 40 will zone temp better...remember you are aiming for 36-38 degrees at head height...its for a beardy ..right?
and cool end (where vegies are at )should be around 20-23 during the day & at night the tank shouldnt get cooler than 16 for hatchie to juve age,water can be 2/3rds down the tank......... ...if thats your pick ...you have sand & that is great ,it retains the temp much better & with lights off at night will keep temp nicely at what you need.