I purchased a small orange goby and a pistol shrimp a week ago. I haven't seen a goby since I put him in a tank. I found a mountain of sand under the rock and my pistol shrimp was near it but no sign of goby. I read that they are shy and will not eat for a few days ... but do they swim around? I did use a dripper for two hours for acclimation. Is there a chance he is still alive? :'(