I was at "That fish Place" today to purchase a diamond goby, but alas they were out. The fish area supervisor looked around and told me that the closest thing they had was this Rigilius Goby. It stated that it was peaceful but I don't really know much else about it. They had beautiful sleeper goby's but the supervisor said that they would get too big for my 75G tank. They were already about 5 Inches and he said that they would be getting bigger. Any input is appreciated.