I use the zoomed daylight bulbs and with 12" tanks normally the 40w does the job. Check the temperature underneath the substrate for the mat with a digital thermometer. Mats produce mostly contact heat so don't want the air much and so it's easy to get a wrong temp reading from them, especially with analogue thermometers. Depending on make, an unstatted heat mat can reach temps as high as 100F so double check temps, it's most likely warm enough. I do prefer to use them at night as during the day the frog would burrow to cool down





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