I am considering stocking a 12 gallon tank with a Goby and Pistol Shrimp pair, (Wheeler's Shrimp Goby or a similar Goby and Randall's Pistol Shrimp), Tail Spot Blenny, and a Clown Gobby. Is this overstocking? If so, what should I remove? Some people say on other threads that this is good, but others disagree.