I have had my cobalt tinc for less than a week, but this is the first day I have noticed her doing this.... She's a pretty good eater and will eat most of the flies I put in almost right away and hunt throughout the day. Today though I am noticing her flicking her tongue out at nothing.... she acts like she thinks something is there, and will often try a few times before she moves on. I would wonder if she was choking or something, except that she seems like she's hunting and will crouch for it, look at it for a long time, and then flick her tongue out a few times. There are some larvae in there from the extra FF's, and I have seen her go for those as well, but I can see where she's looking and there really is nothing. She is doing it especially on the log I have in there (like a turtle hut type log)