It looks like my fish, Columbus, has fairly bad fin rot right now. He's been behaving normally, so I wasn't sure of how bad it was until today. He's been under a lot of stress lately (I am in college and I had to drive home/back to college for thanksgiving break-with him!). He had a different case of fin rot when I first got him (a year ago), and I ran a maracyn II treatment on him. It stopped spreading, but didn't improve, even after 2 treatments. But, he went back to being happy, and things never got worse, so I just kept his tank clean and continued on.
Anyway, the point is that he is in pretty bad shape right now. I am afraid there might be more wrong with him than fin rot (red patches). I have no idea how old he is, besides a year, because the pet store he was bought from is not a chain and I don't know their suppliers.
I have him in a little hospital tank. He is in about 3 cups of water. I just started a TC tetracycline treatment, and I was wondering about how much I should be using. The product says to use 1 packet (500 mg) per 10 gallons. How much product should I use for 3 cups? I put in about two small pinches, like, maybe, 1/30 of a packet, if that. Since I'm afraid the situation is serious, I wanted to know if I should use more, or something different, or do something else. I am going to keep performing a 100% change of water each day, too.
Please help. I love Columbus.