Add as many hiding spots as possible. Grammas and firefish are notorious hiders, so giving as much territory as possible will help.It's a brand new system. Just poured saltwater in and got it to the temp. I have one of those seachem ammonia things on the side of the tank that I was planning to use and planned for water changes every 3 days or so . I do also have an actual ammonia test kit I use for my main tank.
I can add a PVC pipe that I see a lot of people doing to increase hiding areas.