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I think it is fine. Candy cane pistol shrimp (Randall) are smaller than the more common tiger pistol shrimp. I have one in a 10g tank with a goby. They were the only residents originally, he got moved there because my starry blenny started harassing him too much, so I set up my old quarantine tank as a permanent tank since I was done stocking my 32 gallon.I had thought about this but saw somewhere pistols should be kept in a larger tank. You think 13.5 is big enough though?