I have always loved angels and the pygmy is the perfect choice for my 50g AIO. It didn't occur to me that it's roughly the same size and coloring as my springeri damsel that it might be a problem. I am hoping that the pygmy can hold out till the lights go off and the springeri will wake up in the morning and not choose violence. At this point, I don't think I could get either of them out of the scape so I will just have to see how it plays out. I was choosing between the pygmy angel and a royal gramma. Maybe the gramma would have been the better choice. I'll keep my fingers crossed. ugh