The cory looks a bit pale and little emaciated. Typical condition from LFS though. Colours will darken in time with right conditions. Cories are really strange creatures, sometimes they are so peppy and full of vitality and sometimes they just laze around in group. Very hard to predict or read their behaviour. I still haven't figured out my 20 corydoras habrosus. They're just like that. They dissapear at times. But I know at feeding times... they're always out and about. Pandas are one of the smaller cories and don't keep well with larger fish like cichlids but the common small livebearers should be fine. I haven't come across a crazy aggressive guppy though .