I recently purchased a yellow clown goby. I went to feed the tank tonight and the goby looked hungry. I prepared frozen mysis shrimp and put it in the tank. The goby was moving back and forth as to stalk the shrimp. It took the the shrimp in its mouth chewed it a bit then spit it out. it repeated this many times. What should I be feeding the goby? Is there any "treat" I can use to make sure it doesn't starve?