I had lost my female Gold Kribensis, she did have a deformed mouth, but she did eat. The male krib is doing fine and always seems to beg for food. When I took out the dead fish I didn’t see anything unusual on her. I did a water change a day before she had passed.
I’m so sorry to hear about her. She was a sweet and special lady.. I have no idea what could possibly have caused her death if you have no see anything outside her so something inside must have been :’(