gold stripe marron problem

papan

New Member
Hi.
I have female maroon gold stripe and male maroon gold stripe. I had them for about 4 months. About a month ago female's tail stripe started to change it's color from gold to black. and this morning i found femail eating male's tail and it looks like male not gonna live till dawn. What could it be?
When checked the water last weekend nitrate was alittle high but everything esle seemed ok.
 
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