I wonder if this is the start of severe aggression. I haven’t seen her nip the blenny but she’s definitely on her tail when she’s cleaning the glass... that being said, I’m planning some cardinals eventually and will add a rock archway for those. What’s the chances she goes after those when I add them? First pic is her mean mug she bites at me but it tickles my betta is twice her size and bites me when I feed so that’s probably why it doesn’t bother me as bad