HELP!! Stingray Tail Problem

[mastergamer254]

the tip of the stingray's tail fell off but she is eating and swimming just fine i have been adding kordon polyaqua to help should i be worried and is there anything else i should do

 

[rook45]

If there's fuzz then it's gotta be your water....Increase the WC.

 

[ronin_man]

i'd start looking into a bigger tank as well 150g+ ish