Sure, I can help you out with this. I have never used a
heater in their water. When my babies were little and
it gets cold here, I used a red bulb of appropriate wattage
over their tank shining down into the water itself, not
the basking area. This heated the water enough to keep
them warm through the night until their regular lights come
on. I use a true red bulb (not a novelty light) which in
my research I have found does not interfer with their rest.
Buy the ones offered for reptiles in the petstores. My
baby I currently have shares a room with one of my iguanas
so I run a heater that keeps a constant room temp of
no lower than 76 degrees.

A good way to tell if the bulb is of appropriate wattage
is to check the water temp first thing in the morning. One
word of caution. I wouldn't let the room temp drop too low
as they are breathing room air and cold temps even in warm
water can lead to respiratory problems.

Hope this helps Had to share this pic of one of my rescued
iguanas. He is such a ham!
Linda

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