Hello,i have 21 gallon saltwater tank and i have now two ocellaris clownfish they are small babies and i have one black urchin and two crabs but i want to add one more fish so i was looking at the internet and i saw this fish Clown Goby(Gobiodon citrinus) and i thought it will be so perfect to add it with my two other clowns and i will finish stocking but the question is does it need any soft corals or any coral in the tank to rest on it? i don't have any corals in my tank it's fowlr tank and the question is do i need any corals to get this fish? or it will be happy without corals? i have been searching for this but i got nothing helpful so i hope im gonna get some helpful replies 
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