Nice looking tank setup, and good looking stock. I am in the same boat you were, still can't decide on final stock list for my tank and mine is a couple of years old.
Nothing makes you happier as a fish keeper than design the perfect filtration system for your tank (or as close as possible). I am still tinkering with my filtration, much to my partners annoyance. It looks completely different to its original setup.
Keep the updates coming and good luck with the sick fish.