I notice that you said the tank was fully cycled but that you report you had low ammonia , nitirite and nitrate readings.
This is not a fully cycled tank! that can also cause fin and tail deterioration.
pure ammonia can be found in hardware departments. if you ever decide to get some make sure it has NO additives like soap or perfumes. Since you already have a tank up and running- when you get your next tank you can kick start it by using some old filter media from your current tank as well as some STABILITY.
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