i sure don't know, and can't tell by a pic
what are your water temps and readings? how many fish, how big is your ft and how big is your gb?
100 8 month fish. 200 2 month fish. Tank is in ground in the tropics. Nitrite is ok. The dead fish was about 3/4 lb. Grow beds are 4 ea. 3 ft x 20 ft. Fish tank is 4x4x10. I am running a air bubbler, 4 places.