He I just had a super tiny yellow watchmen goby pop out to say hi, after not seeing it for a couple months, lol, thought he was a goner! Fish had sometimes for long periods of time. If that fish didn’t come from me then I’d probably guess it died, but being that it came from me, if it didn’t get killed by something then it is still in there. Should just let your tank be and let it get comfortable or it will never come out. Moving a bunch of rock work to find an extremely small and delicate fish I dangerous for the fish, getting smashed and what not. Yes fish love hiding places, especially when entering a new environment, but all the pink streaks I had were just fine with some pvc tubes. I just sold the last one, he was in a tank with a royal gramma, scopas tang, diamond goby and a pair of pintail wrasses. Pink streak loved his little 1/2 inch tube when it felt the need to hide. All the pink streaks had great personality and really active. Hopefully you don’t crush it. Good luck with your new one you’re getting. Make sure to Qt it, or long observation.