Madarins will not do well in a small tank. They will eat other things, but mainly they LIVE off of copepods and other stuff in your rock. You need old, established LR, in LARGE quantities, in a LARGE tank (125g have starved mandarins before) You should also have a sump or fuge to help colonize more food for them.
Lots of fish will fit in a tank that size. I have a buddy that has a 10g salt with crushed coral and some LR from one of my tanks, he just keeps softies in there and a couple damsels. Thing looks great pretty low maitenence as well.
That being said another cool fish that can live in smaller tanks are scorpionfish. You can keep these guys in a 30 because they dont move around too much, worth looking into.
GL, post pictures
Lots of fish will fit in a tank that size. I have a buddy that has a 10g salt with crushed coral and some LR from one of my tanks, he just keeps softies in there and a couple damsels. Thing looks great pretty low maitenence as well.
That being said another cool fish that can live in smaller tanks are scorpionfish. You can keep these guys in a 30 because they dont move around too much, worth looking into.
GL, post pictures