Hello. 
I am new to bonsai care and would need some help. 
I got a Carmona tree about a month ago. The leaves were initially green and healthy but after about 1 week they started yellowing and falling off. So did the small white flowers it had at the time.
I changed its position to a place where it would get more light. It is currently in a west-facing window. The average temperature is around 21 degrees and humidity about 55-60%. I water it when the top part of the soil feels dry, about 2 times a week. I water it until the tray below fills with water. I use tap water that I leave in a bottle for at least 24h before watering. 
The leaves are still yellowing and falling off, although maybe at a slower rate. They look rather sad  I also noticed once or twice a small fly around the tree, but i thought it's just a normal fly. Could it be some sort of parasite? 
What could be the cause? Does it not get enough light? Is it a disease? 
Thank you for your advice  

We have many questions about this species. It is a very hard to grow bonsai. We think it has to do with humidity. Our house may be way to dry.

Hi! I also have this wonderful tree. For me, keeping this bonsai alive isn’t too hard; I think the climate suits the tree. However, establishing a proper structure is a completely different challenge. Since I’m a beginner and most of the branches grow straight up, toward the trunk, or into each other, I still have a lot to learn and plenty of work ahead. So, I just share my growing conditions in hope it might provide some useful information. 

To keep it alive, I placed my Carmona in an east-facing window. I water it quite a bit year-round, especially in the summer when temperatures exceed 30 degrees Celsius. On those hot days, I water it every day, and once a week, I give it not just a mist but a full shower and soaking. I make sure not to let it dry out completely. In winter, my room temperature stays around 25 degrees Celsius, while outside temperatures can drop below -25 degrees Celsius. I still try to ensure that the bonsai doesn't dry out completely by watering it 2-3 times a week, but with a smaller quantity of water compared to the summer. Also, I don’t soak it in winter; instead, I occasionally spray mist on the leaves because the air is dry in my home. 

Which region are you in

Baltic states

also, forgot to mention that I keep the tree always inside

Very interesting. Please stay around and help all the beginners with dieing carmonas going forward. The only one successful here so far is in a humid subtropical climate which is not very useful for most beginners.

I have 8 years experience with approx 30 different species. Carmona is the only one I have failed several times and given up on.

hey, I guess I am just lucky. For me it just grows on his own  I have my camrona for 3 years now.

I couldn't find a photo of the tree before pruning, but here's what was removed. Now, my tree looks a bit bare. I tried to cut away anything growing straight up, toward the trunk, or crossing into other branches.  Of course, the tree has now been repotted, and I had to remove some roots. I know repotting at this time goes against the usual guidelines, but the previous soil mix was already in poor condition.

P.S. I couldn't upload the MP4 video file directly, so I've included it in a ZIP file.

Good luck with heavy pruning and repotting at the same time and at the wrong time of the year. Please come back in spring and show us a healthy tree.