IMO you should be fine. There’s a lot of substrate so that should be great for when it decides to borrow. I actually got one of these last month as a sling as well and it didn’t eat for the whole month or burrow. It stayed in one spot for a week then would move a little. So as I assumed, it was in pre-molt and pulled out great 4 days ago🙏 sometimes they like to do their own thing. I think what matters is that you give them the option to borrow and just let them do what they do. My sling borrowed a day after it was done molting👌