Velvet, crypto or brook. Look at the rest of your fish, keep an eye on their behavior and any changes in color, breathing or appearance of obvious parasitic infection.
Everyone commenting about the temperature being "off" by a degree, or the "low" pH just needs to stop. It's not that.
A dead fish looking chewed is almost always an effect of it sitting on the bottom of the tank and getting munched by the CUC. Unless it was observed getting sucked into and spit out of the power head, it's probably an infection. Especially if other fish are flashing.
Everyone commenting about the temperature being "off" by a degree, or the "low" pH just needs to stop. It's not that.
A dead fish looking chewed is almost always an effect of it sitting on the bottom of the tank and getting munched by the CUC. Unless it was observed getting sucked into and spit out of the power head, it's probably an infection. Especially if other fish are flashing.