Flame Angel + Diamond Goby

jimmy 4

Member
20g long tank.....
I have a flame angel and two clowns. I plan on selling the two clowns and their anemone.
My question is could I add a diamond goby after I sell the clowns or should I stick with the one fish? I need something to keep my sand clean. Is it a bad idea to keep a diamond goby in a 20 gallon?
 
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