green sev. question

I use to breed them there 4 that I kept
 
I have a new pair of babies, around 3", and as they are acclimating they sometimes freak out like that, bashing about. They're in a quiet room, next to my bed, and are gradually getting used to me. I try to get their attention and be very mellow when I approach them.
Strangely enough, my year-old Sev has never exhibited such behavior. He was much younger when he came home, and is with tankmates that were close in age when I put them together.
 
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