I think so, if the ammonia spike wasn't too great. Sometimes it can cause gill damage and burn through mucous (usually only if there is a lot of ammonia present). The gill damage can heal quite quickly if it isn't too extensive. The lack of mucous on the fish can sometimes leave them open to secondary infections though. Keep an eye on any skin lesions you might see. And aeration, aeration, aeration. That will make it easier for the potentially damaged gills to do their job if there are high levels of oxygen present.
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