Well, you're saying yourself what to do: get a thermometer and check the temperature where the T's cage is standing and in case it's less then maybe 22 deg. C in summer, slap a heatpad against the side of the cage and check the temp. again after a while to see if you will need to adjust the contact zone of the pad against the tank to raise the temp. to 25 to 28 deg. C. during daytime. Do not overheat, though! The heat pad should be switched off over night. After the T' has moulted you can rehouse it into a bigger enclosure.

Another thing: are you making sure that a part of the enclosure is always moist (preferably the part the heat pad goes against)to prevent dehydration? Or has the T' got a water bowl?

Good luck with your B. albopilosum!

I've been keeping it moist with a spray gun.

Suppose one of the reasons I'm so concerned is the timespan that it has locked itself in it's burrow for such a small spider.

I bought the Keepers Guide but no amount of reading can make up for experience...pretty frustrating!!

I'll look into getting a heat pad...thanks.

Don't forget a thermometer