Unfortunately youa re going to have to move your baby dragon into a much larger enclosure. Its too bad someone sold you a beardie telling you they could live in so small of an enclosure. Adult beardies range from 17-22inches easily! Way too big for a 29gallon.
A 40breeder is ok, but i know my active 19 1/2inch female would NEVER be comfortable in a tankl that small. If you are going with standard aquarium sizes, i recomend a 50 or 60 breeder, or a 75 gallon.
If your husband is handy it might be cheaper and easier to just build a new enclosure for him.
There are lots of care sheets on the interenet and good books available, there is also lots of good information on this website. But since the person who sold you your dragon told you he could live in a 29gallon, im just gonna say a couple basic beardie things in case you were in formed wrongly.
1. Beardies need a hot spot of 95-110 degrees in their enclosure. This can be obtained by putting a dome reflector with a bulb in it on top of the tank. Make sure the beardie can get nice and close to the lamp without actually burning himself.
2. Beardies also need a UVB bulb. Without this there is a high chance that the beardie will die. They are a little expensive but definately worth it, they shuld be replaced every 6months-1year.
3. Feed your beardie a variety of small insects and finely chopped veggies. At this age use a calcium powder on the crickets daily or every other day. Let your beardie eat as much as he wants!
good luck with your new buddy. feel free to ask any questions at all, everyone in this forum is really nice and willing to help out!

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