Behavior & constipation?

More questions 🥲 we added a calico oranda to our tank today, yay! That being said, I would like opinions on how they are behaving with each other? To me to it looks friendly, but I literally know nothing about fish behavior! Lol this was right after their first feeding together. Also, while videoing the behavior I noticed my black moors poop. Is that normal? I fasted for 2 days and then fed peas for a few meals about a week ago and now it's back to looking like that!

**excuse the cloudy water, I just did a water change and have a softener system so I have to add equilibrium!