Love the helfrichi idea
I would pick the tiger watchman over the diamond or golden head sleeper. This is my own opinion, but the other two are sand sifters and a 57g might not be enough sand for them. They can get pretty large and they will turn over your sand really quickly. The tiger watchman is not a sand sifter and you can pair it with a pistol shrimp.
Toby puffer: They will eat your inverts so keep that in mind and they can also go after other fish. If it decides to nip and bully the helfrichi firefish, he will win easily. Also, you are pretty much locked in at this point in not having corals.
Great clown choice
Great last choices as well, the ORA orchid dottybacks seem to be a little bit less aggressive which is a good thing.
I would pick the tiger watchman over the diamond or golden head sleeper. This is my own opinion, but the other two are sand sifters and a 57g might not be enough sand for them. They can get pretty large and they will turn over your sand really quickly. The tiger watchman is not a sand sifter and you can pair it with a pistol shrimp.
Toby puffer: They will eat your inverts so keep that in mind and they can also go after other fish. If it decides to nip and bully the helfrichi firefish, he will win easily. Also, you are pretty much locked in at this point in not having corals.
Great clown choice
Great last choices as well, the ORA orchid dottybacks seem to be a little bit less aggressive which is a good thing.