I am a new bonsai owner. This Christmas I received a Chinese Elm as a gift (apparently this is a good tree for beginners?) I decided to purchase a guide book to help me but I'm still not sure I'm doing things right. At first I didn't know how to water it properly so I let it dry out by mistake since then I've been watering as and when the soil feels a bit dry but when I did this I would get a layer of mould form on top of the soil. After reading the book and several posts on the forum I decided to repot the tree this week. First I covered the drainage hole with some mesh, I then used a thin layer of vermiculite followed by a layer of bonsai soil. I also started using a rose head to water the bonsai. Since then I have been watching closely I noticed excess water draining from the bottom the day after watering and reporting but not since. I've also noticed a small layer of mould on one of the lower trunks which I have been brushing off as needed.
As I said I am very new to this , I would love any advice, hints or tips it would be most appreciated