Yellow Needle tips on Chinese Juniper

I think your soil substrate being 100% akadama is your issue, being that akadama holds a lot of water and junipers do not like “wet feet”. A more suitable mix 1-1-1 akadama, pumice, lava will give a better balance of water and oxygen.
What stage is the the tree, development or refinement? If it is in development a good nursery mix or straight pumice is what the tree should be potted in.
Good luck :+1:t2: