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[bunnykin]

ok about the lighting/heatting during winter...

Some people do like to follow nature by going with winter however, It hasn't been shown that this "helps" the beardies in anyway as winter brumination is an adaption not a necesity. If you choose to go with winter yes there will be alot of changes you will notice.

As far as the "little one" that is not eatting...
you must must have them in seperate tanks not even seeing each other.It will be ok to use the old tank for the little one just make sure you sterilise EVERYTHING and you can change the furniture around. As far as it not eatting can you tell me more about it (ie. age, how long youve had it, how much it is out of tank, the temps, its basking habbits, what you offer it including salad, furniture, etc)