I dunno maybe the pictus is the way to go. the Oscars aren't likely to try to eat it/them and the gills will chase them but don't think their mouths are big enough to eat them. Maybe I'll think about 4 of them or so. I'm also considering the 4 line for much the same reasons but it seems they dont do well with others of the same species.
This is how MTS is formed I guess.
This is how MTS is formed I guess.