The 20 nitrates was taken the day after a WC and heavy supper they received.Id go with a melafix/pimafix or api fungus cure combo, salt and an increase in WCs. If after an 80% WC your nitrates were 20 then before that they must have been pretty high. Ammonia burn? You wont be able to tell if there was an ammonia spike since you didnt test before the huge WC. My red wolf got what looks like that after i didnt notice a jumping wound (cut on the snout) for a few days.
There any plecos in the tank? Or have you observed any bullying?
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There's no pleco or bullying. The endli and delhezi are my oldest poly, 6 yrs old and never battled with this kind of sickness before.
you're the 2nd person to recommend the api fungus care, I would like to ask why do you think fungus care is necessary?