I have a 6" Jardini that was eating fine. Meal worms, shrimp and feeders.
Parameters when first saw it swimming around weird:
HP = 6.4 - 6.6
Amonia and Nitrite = 0
Nitrate = hard to tell, color was red, the color card has 40 and 80 both red and looks similar. So Nitrate was border line and I used Nitrate reducer and it went down.
Temp = 76 - 77 F
My brother called me and said it was swimming around like it was dying and he put it in my hospital tank. When I got home it was standing on it's tail in the corner, breathing normal kind of but from time to time it would curve it's body and go upside down and right side up again and on it's side and it would just keep curling it's body. No physical signs like bleeding or anything with scales or gills or eyes and things like that.

Tank mates seem to be fine. My tank is overstalked and I'm on the verge of thinning my tank out, just haven't had time yet.
Parameters when first saw it swimming around weird:
HP = 6.4 - 6.6
Amonia and Nitrite = 0
Nitrate = hard to tell, color was red, the color card has 40 and 80 both red and looks similar. So Nitrate was border line and I used Nitrate reducer and it went down.
Temp = 76 - 77 F
My brother called me and said it was swimming around like it was dying and he put it in my hospital tank. When I got home it was standing on it's tail in the corner, breathing normal kind of but from time to time it would curve it's body and go upside down and right side up again and on it's side and it would just keep curling it's body. No physical signs like bleeding or anything with scales or gills or eyes and things like that.

Tank mates seem to be fine. My tank is overstalked and I'm on the verge of thinning my tank out, just haven't had time yet.