Just wondering if there are any fish stores other than petco and petsmart in the Dubuque area?

I dont think so, I think the nearest place that sells anything is the Fish Shack in Manchester. I have been there once a couple of years ago. Not much for corals but quite a few fish.

There was the fish shack here in town, but it up and disappeared.  I am not sure if it went out of business or they just moved everything to their manchester store.  You'll have better luck visiting the quad cities.