Bought a dawn redwood rainforest a few weeks ago from a bonsai website and noticed the past few days its started to have white stuff and the base of the trees, ill add a photo. Its goes away when i spray the tree but comes back the next morning. I water the tree every morning until i see the water coming through the hole in the pot. So im guessing its getting watered enough? Should i maybe use different soil ? I have a mixture of Kiryzuna and Pumice but read thats for pine and juniper only ?Also i keep my outdoor bonsai under a glass roof but its still outdoor. Is this ok ? Didn’t want them fully outdoor as i live in Scotland and the weathers quite cold but we have been having a heat wave past few weeks.