As an update, today I visited both Aquatica and Rob's in Tinley. They were very helpful at Aquatica, but their prices were high and I don't feel like they are properly caring for their animals. Tanks were in general dirty, lighting was insufficient, and some of the livestock looked unhealthy. It seems like a very beginner friendly place, and the staff themselves were great. A+ on the kids working there for attitude and helpfulness.
Rob's seems like a place for experienced Reefer's. Rob himself was friendly and helpful, but obviously very busy and a little distracted. That's not a dig at him though, he was very helpful, I imagine he just runs a leaner shop with less staff, which is fine. His tanks and livestock however were in much better condition. Every tank was clean, all of his livestock looked healthy, he had a better frag selection and all of his tanks were lit appropriately. No animals struggling for light.
I would visit Aquatica again if I were looking for equipment or a tank, but for live stock I would go to Rob's. Better selection, better prices, and his animals are cared for better. From a livestock perspective I feel Rob's wins by a long shot. A very long shot.