baby silvers look very different when they are very small and have black on them when stressed i have 20 baby silvers that all had yolks when i got them not impossible to keep them alive juat hard and i have never heard of a blackxsilver hybrid i dont know if its possible or not
I had a baby aro (jumped out of my tank ) but didn't look like that there was a small circular patch on mine that was blue and black and gray i think... hmm but didnt look like that.. not sayin he is no a silver but...
Sorry couldnt be more help.. but hoped it helped some..