Ok...I'll share my expierience with Preuss Pets. I do think they are possibly national but maybe only in MI. I've had a sick rainbow for about 3 weeks and I called to see if they had a certain medication I had read would take care of bacterial infection. I had used Maracy & Maracy II for two weeks plus switched to another one for a week. He wasn't eating etc. Couldn't believe he lived as long as he did.
Long story short, they ask if I could bring the fish in, they have a specialist there first thing in the morning and late afternoon. I took the fish in, they did a scraping to make sure it wasn't parasite, confirmed bacterial and told me they didn't think the fish would survive..to weak...they sold me just enough medication to treat. I was so impressed as I have spent many hours trying to find what I could do for this fish.
So in the future, when it's something I'm not having success dealing with or I'm uncertain it's good to know there is a place like this. They didn't charge me for anything but the little bit of medicine, which was $3.00.
Just thought I would share this in case you have one of these shops in your area. The fish were awsome as well.