The next morning her entire body looked pink, as if she had a sunburn.
I moved her to a QT dosed with Furan-2 (nitrofurazone and furazolidone) suspecting hemorrhagic septicemia, but she died that night.

Her 4 tankmates, all L134s, appeared unaffected.
Today another L134 in that tank has red leading edges of fins and is breathing heavily. His tank mates don't look quite right but I couldn't explain in what way exactly. The spectrum pellet food I gave them this morning is untouched and it seems they have all been off their food for a few days.
Any suggestions? I really don't want to lose anymore of my Leopard Frogs

specs:
20g long, well water pH 6.6, temp 78, food: hikari sinking pellets & kensfish 4 bit blend (egg bits, earthworm bits, spirulina bits, & color bits)