I have a dragon goby. It eats mysis, brine, and even flake. My dragon goby is in a 46 gallon tank with 45 pound of live rock all he does is sift sand all day. I have seen him eat all the foods mentioned above. You could always try soaking food in garlic, it always entices the fish to eat and helps their immune systems. Good luck
I think that Granny might be confused, the dragon goby is not like the mandarin dragonette. People have told me that mandrins need high pod populations to live, and i know they do, but with the dragon goby i think its different. The diamond goby does the same thing as the dragon goby does, i do believe that they might need some pod population but they are more willing to except frozen foods in comparison to the mandrins. I hope i helped
heres a pic of the dragon goby, i love mine :happyfish