I bought a watchmangobie/shrimp pair about two years ago, and the gobie died a year later. I waited a year till I got the perfect gobie for the shrimp, big mistake, the shrimp doesn't listed to the gobie!! He shakes his finns and no responce from the shrimp!! Since the gobies about 1 1/2 in. long and the srimps topping 4 almost 5in. he sometimes pushes the gobie outta the way to get to food The both still hang out, but the gobie gets no respect!!