oh, thanks for the fast reply! haha
The last one isn't wild, I think he was just slightly stressed when I took the picture. They show the bars like that when they feel uneasy, like when you first add them to the tank, or when the severum comes near them (even though he never shows any aggression at all).
And I was thinking about getting probably 2-3 more corys and a school of maybe 8 of the Red Coral Pencilfish for my small schooler. If I can't find any of those (wouldnt surprise me) I could settle for like 15 cardinal tetras.