There is nothing special here in Duluth right now, would be a waster of your time. My wife and I head for the cities when we want to look at stuff. We recently when to Wet World, Ocean Devotion, World of Fish, Something Fishy, Har Mar pet store and Forest Lake pets.
I would recommend you go to Wet World, Ocean Devotion. Their tanks look great and have a huge variety.
World of fish is okay, Something Fishy is just down the block from it but right now they don't have much to look at and all their fish looked stressed.
Har Mar pet store was a waste of gas.
Stay away from Forest Lake pets unless you need a cheap tank and stand. Their tanks are horrible and should be scrapped and get all new tanks and equipment.