Goldfish developing black lines on tail

A

anduknodis

NCAA 06 Top 100: Iamcrunk
Nov 16, 2005
42
0
0
36
Texas DFW Area
I left my house for 3 days on a thanksgiving vacation and i have come back to notice my comet goldfish's tail has a few black streaks on it. His behavior seems normal but i was wondering if this could be harmful to my fish or a possible disease. Please aid me in figuring out if this is just natural to his looks or a problem i need to fix.

If it is a problem that anyone knows how to cure please tell me how to help my fish.
 
Hi. I don't have an answer. But this reminded me of something similar. I had 3 goldfish in a 30 gallon tank a few years ago that where real healthy and old. One day I noticed that one of them had black lines on the edges of his fins. I thought he was just changing color as goldfish do when they mature. Anyways, it happened to the others and a few weeks later they started resting at the bottom of the tank. Then they died one by one. The water was perfect and to this day its a mystery to me.
 
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