I just got a citron gobie a couple of days ago and he is in my 10g along with a royal gramma. There are a few snails for cleanup but other than that no other inhabitants. I haven't seen him eat anything and I have tried frozen mysis, brine, prime reef flake and formula 2 flake and pellets. No go on any that I can see. I am hoping he will get hungry enough and eat.....I soaked the flake with selcon last night and tonight I will soak in garlic hoping to entice the little beggar toeat.........