I was just wondering if this is a good list I have them already in my tank 2 clown gobies yellow and green and a yellow watchman and tiger pistol. Also a chalk basslet and sexy shrimp cleaner and variety of snails and hermits it is in a 14 bio I have a decent amount of LR but could add more also I have feather dusters.. I do a 3 gallon water change a week. My question is probably a dumb one but can I add another fish possibly??