How long has this tank been running? I'm sure there are people with 50g tanks that have more fish in it than you do. Does not mean that that's a good idea though. I'm sure you'll get other opinions but mine would be that you have plenty of fish in your 50g. With that much live rock in there it doesn't seem like there is a lot of swimming room left. Are you doing anything special for nutrient control? Running a refugium with macro algae, mangroves, bio pellets, zeovit, etc? If you employed a somewhat aggressive nutrient reduction method then maybe you could get away with another small fish that doesn't really swim much. Or you could get some inverts like shrimp, crabs, etc.
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