Hi Carrie, and welcome!
I will echo most of the thoughts already presented. I would also agree that you might have a few too many fish in the system.
You mention that you test regularly. It might also help if you could post your water parameters, I'd be curious as to what your Nitrate has been at.
A few have mentioned garlic as an ich treatment. I once had a small breakout of ich and learned about the garlic cure. Not only is this a great treatment but it's also good for prevention. We squeeze a little garlic with the food once per week. garlic helps to enhance fish colours and also acts as an appetite stimulant (So I'm told). Regardless, we have never had a problem since, and we have stressed out our fish plenty with moves!
Good luck, and let us know how things are going.
Rob
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