[Troy F]

Welcome aboard Chris. Sounds like the making of a nice system. I don't think it will matter too much with the order you put the fish you've listed in. There are those who will say the chromis will pick on one another but lots who've had success. I'd be cautious when choosing your Kole, I notice that a lot of these fish have damaged mouths and according to a recent article this is common due to collection practice.

As for another fish, the world is your oyster. There are many awesome fish that would do well with the list you have so far. One of my favourites is the purple firefish (Nemateleotris decora. Have fun.