Yellowing leaves?

Mcspeed

Jon with no pics, I am thinking that with changes in light and temp somewhat( you say it's inside so unless your heat is on, it's probably not temps.), you need to watch your watering more closely. The trees watering needs diminish as the fall approaches, because it's cooler, and less light starts signaling the tree to head towards dormency. Check more closely to make sure you aren't overwatering.

Doesn't sound really bad if you have new growth, and flower buds, and they will shed some older growth here and there too, tis the season, so to speak, even though they are semi tropical.

That said, do some reading about "inside trees", your asking about putting it in the middle of the room suggests that you need to become more informed about your spicies of tree, horticulture, and bonsai in general. If you got care instructions that say soak in a tub once a week, put it on your television and enjoy it, please throw them away, and read, read, read, there is a vast amount of good helpful info here, do a read thru of the beginners section, and Happy Bonsaiing.

Bill