Welcome! You’re lucky with your soil. Most Chinese elms come encrusted in an impenetrable brick of mud so at least you’ve got a better chance than most. I got my first one last year, which also came in Akadama so I have had no problems whatsoever.
Firstly, I keep mine outside year round. We had a mild winter but these will survive most of anything our winters can throw at it. They may survive indoors with careful treatment, but they will thrive outside, where they belong.
I got mine last July and because it was so hot the soil would change colour on top very quickly and drying out quickly meaning I was having to water twice a day, so I soaked it in the sink for a few minutes then brought it out to drain. This worked really well and it put on a heavy second growth spurt. There’s no need to be so heavy handed in the main though.
I have found that the surface is quite obvious when it starts to dry out and Akadama seems to have good wicking properties so if it is drying on top it’s unlikely to be very wet underneath, as long as the drainage is good.
It is particularly important not to overwater a tree (or any plant) indoors though as water will sit much easier where the wind and sun can’t get at it so be aware, but soaking and draining would be less messy indoors. I now just water mine with a shower garden hose once a day with the rest of the plants and it’s happy as Larry. Good luck.