what medicines did u use? i had a lil hex outbreak in 2 tanks a lil while ago. cured every fish except one which is still fighting in a quarinitine. i used 2 diff meds, both pill form that disolves in water. i would keep trying untill he passes away. my fish ate small worms no matter what during their sickness. i recomend finding some live bloodworms, or use small earth worms. milipeeds are an attractive meal also. my fish can't resist squiggly stuff even on thier death bed, even if they only eat 2-3 thats one more day u can hopefully find a med that works