I'd recommend going to Adrienne's sometime and looking at her fighters. She has some lovely PK's (Plakats). They're less hassle than fancy fighters because of their shorter fins, but still have just as much colour as fancy fighters. Means they can go with fish that might normally nip long fins, I have my blue PK in a 54L with two dwarf puffers for example. I'd say you could only have an otto or two in that sized tank though.
HTH