i have had my firefish goby since the first time i set up my tank which was in january. it survived a heat out burst (stupid heater). survived while moving rocks and sand. so they are pretty hardy. my goby is a monster. eats anything i feed it. i have fed it tropical (freshwater) flakes, frozen brine shrimp, frozen krill, frozen mysis shrimp. good luck with your goby if you decide to get one
henry