Thank you all for the kind words!
I'm not really sure why it looks different, it's kind of hard to tell from the picture (weird angle) but it looks great IMO. I would imagine appearance would have to do with a varied diet, tank mates (competing for food), male/female, stress, water quality/changes etc.?
I'm no pro, I'm learning as much as I can as I go as I'm sure many have and will. Hopefully someone with more experience could chime in and give their input!