I have a yasha goby and pistol shrimp... They were pretty regularly coming out of their tunnel to eat when it was food time up intil the last two days which is coincidentally after my last water change. Im wondering if there's a chance I could have burried them when I added the new water, or if they move areas where they tend to be over time. Maybe theyve moved to a new location Im not aware of... Either way, I loved those two and hope they're still in there. Any suggestions?