DLC = Dark Lord Corals, they are in Brookfield and have a website, though I don't think it has been updated.
I used to go to Sharkys when they were in the basement, haven't been there since they opened the store (Doubt they would be happy to see me

).
I've heard good things about them since they moved, just be sure to QT/Dip corals, they get a lot of turnover and you may get an unwanted hitchhiker.
ShoTank in Mundelin on Rt 45 is my go to place for fish in the area. Their coral selection is mediocre at best.
There is a place in Fox Lake, Fishy Buisness or Something Fishy, one of those names, good selection of big fish, poor coral selection.
Tank for you is in our back yard, haven't been in there in about a year but they had some decent fish options last time I was there. Keep meaning to stop back there, they are on Depot Rd. by the Pickard China place.