New Cories Are Flashing (?)

[Coco1019]

I brought home 5 julii cories last Sunday and they've been in QT ever since. Yesterday I noticed that one was flashing along the bottom and another was doing it today.

Water parameters are fine - test with API Master Kit
Temp is at 80

There is no substrate...could it be stress or is it more likely ich in the gills? There aren't any white spots.

 

[Coco1019]

Thoughts? If it's most likely ich, I want to start treating right away, but aren't cories intolerant of salt?

 

[boadams87]

You just need to turn the heat to 86° and do daily water changes.

 

[Oceangirl]

Do you have any pictures? Flashing could be for a number of reasons, I use Prime and sometimes my cories flash after a water change, could be Nitrite, or contaminate in the water. What exactly are the parameters.