I would recomend a bigger tank if you are going to addd a new addition and make sure that there is lots of hiding places. I would go with a 20 gal long just to be on the safe side. Also try and introduce them to the tank at the same time. I would also add a few climbing places like some drift wood. My fat tails climb from time to time and I use a drift wood log for a basking spot. I have not seen them use it during the day but they are all over the place at night.

I hope this helps!

Thanks

Mike
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Michael Garrett
The Gecko Zone
Houston TX

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www.thegeckozone.com