My fish, Tim, recently started getting black edges to his fins. They didn't appear inflamed so I wasn't worried. He was very young when I got him and his fins have been growing like mad, but all new growth was starting as clear and then slowly gaining color. This is the first time color has appeared from the outer edge so I am beginning to worry about rot.
He'd begun to turn silver on his head and body for a day or so, but when I got up today he was back to his normal colors and actually flared for the mirror for the first (!!!) time. Then I turned my back for all of eight seconds and he somehow tore a chunk out of his tail fin. >_<!
He currently lives in a 6.5 gallon tank with a filter (muffled by a sponge to avoid too much water ripple), a heater (79 degrees F), a silk plant, a live plant, and some Terracotta pots for caves. I do 30% water changes every 6 days.
I have tried repeatedly to get a good picture of his fins right now, but he's randomly gotten some strange burst of energy and is running a circuit across the back of the tank and in circles around the filter intake and the heater. (Here's the little blur in turnaround: http://img.photobucket.com/albums/v2...a/188f9fea.jpg
) So I think I'm stuck describing the fins best I can:
They have smooth edges and no visible loss, but have black coloration at the very end. They were not this black yesterday. The tear is near the top of his tail fin, a chunk about a quarter of an inch long that spans two of his spines.
I've heard of aquarium salt as a means to help with wounds and stop rot in early stages, but how do I properly use it? Do I just add it to his tank as is or do I need to move him into something else?