Hi,
I live in the Pacific Northwest and have Tincs and Imitators and keeping tanks warm can be an issue in the winter. The tank temps can dip at night down to mid 65-68 but the temp comes back up during the day. Most do well with room temps 70's
There is a very good book on dart frogs called "Posion Dart Frogs" by Amanda and Greg Sihler. this is a very good book on the subject you can find it TFH.com.
I would be worried if the temp get too close to 60 below 60 would be not be good. Temps in the mid to upper 70's is best (75-78). If you are worried you can put a heating pad under the tank to warm it up. I have one tank that I thought was too cool but when I move the probe around the tank to get temps there were warm and cool areas in the tank, so the frogs can find the temp they want.
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