i use to have a dwarf gourami in my tank before the Serpae Tetras, (well i got them after my dwarf pasted away). and he was fine there was no problems with fin nipping at all, he even can up for pats. i even got him a girlfriend, but she then died of that dwarf gourami diseases and then the boy followed. (i love dwarf gouramis, but the disease only lets you keep them for a couple of mouths

)
my black widows are very peaceful, for being only three of them.
so if i didn't have the black widows and the Serpae Tetras, i could have a gourami, maybe two?