I have a 55 gallon reef aquarium, I am looking for a fish or invertebrate to keep the sand stirred up and clean... I've heard good and bad about the diamond Goby... What are your opinions? Do they make that big of a mess and if so, is the mess worth it? I have all of my rock down middle of the whole length of the tank. If no to the Diamond Goby, then what do you recommend? Thank you!