I did what you recommended as soon as I got home that day. I did a 50% water change, added 3 tbs aquarium salt and an extra air stone. They seem ok. I had some red root floaters I couldn't keep from being sucked under, so they were dying off. I took them out because I thought they were affecting my water. When I tested it appeared I had a tinge of Nitrites (not quite 1 ppm) in the water. Also my red racer nerites were not active, so it was worrying me. Since I took them out last week I've registered zero nitrites and 25 ppm nitrates. My nerites are much more active now, so I think it was a good call.
All that is to say, thanks.