Have you tried live brine shrimp? I have one of the golden head gobies that wouldn't eat for almost a week. I added some live brine shrimp soaked in Selcon Fish Food Booster and after trying a couple he couldn't get enough. After two days I switched to mysis shrimp soaked in Selcon and now he eats this too. I have found that he won't eat any foods soaked in garlic (at least not yet). I thought for sure this fish was going to starve to death but now he is doing great. Good luck with your fish.