So I went to the store and purchased a dragon (or violet) goby for my 40g hex front. This is my first shot at owning an aquarium. I added the prescribed salt for this goby and purchased some frozen blood worms. Anyways I have attempted to feed him for 3 days and have not seen him eat any of this. I have placed some food probably 4 inches in front of his face and he has not eaten any. On one occassion a few worms were even resting on his back and he did not touch them. Now I only feed my fish in the morning before work and right before I take my dog for a long walk so I havent had more than 5-10 mins to watch him but still I am a bit worried. Sometimes he surfaces to the top of the tank for a swim but today I have noticed him kind of floating back down slightly lethargic. I dont know if that is a sign of unhealthy or me over analyzing. Upon research, several websites have given me various opinions. Some say they are hearty eaters, some say they are scavengers and eat algae and other scraps. What should I do, what should I look for? Should I be concerned?