Joe,
This kind of Den is very tough. Down to 15c is no problem for them as long as they are not exposed to temps below 10 in prolong periods of time then they are fine.
If temp stays around 15 or so, they will not put out much growth or roots.
Warmer temps to around 20c will initiate growth again.
From the pictures, your plant looks ok to me. One yellow leaf is nothing to be concerned about. One caution though is over potting. These dens. like to be under potted.
You can do one of two things, either put it into a smaller pot, or I sometimes pour out some of the bark mix and fill it in with pebbles or broken pieces of clay. This way the medium won't stay wet for too long.
Again your plant looks good, the only thing I would change is the potting.
Andrew
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