Last time my mollies got columnaris (2 deaths). The time before, it was problems with fish shipped to me (2 deaths). This time, everything was going great for the first couple days, then my most valuable fish (a female hifin lyretail sword) came down with an apparent swim bladder problem 
. She would energetically swim to the surface then sink back down to the bottom. Most of the time she would be resting in a secluded corner and breathing hard. She started showing symptoms a couple hours after feeding on dried flake floating on the top of the water. Thinking it was food related, I stopped feeding flake, instead I fed the tank fry food and peas. The second morning, I noticed her bottom lip started to swell. When I came home from work, she had cotton mouth. I put her in a hospital tank and medicated with Furan-2. I also performed my weekly water change and started adding salt. My water stays with undetectable levels of ammonia and nitrites, and nitrates stay below 5ppm (changes always add nitrates, but my mangroves suck them up quickly). PH stays between 6.8 and 7.0.
Any theories on what is going on?
. She would energetically swim to the surface then sink back down to the bottom. Most of the time she would be resting in a secluded corner and breathing hard. She started showing symptoms a couple hours after feeding on dried flake floating on the top of the water. Thinking it was food related, I stopped feeding flake, instead I fed the tank fry food and peas. The second morning, I noticed her bottom lip started to swell. When I came home from work, she had cotton mouth. I put her in a hospital tank and medicated with Furan-2. I also performed my weekly water change and started adding salt. My water stays with undetectable levels of ammonia and nitrites, and nitrates stay below 5ppm (changes always add nitrates, but my mangroves suck them up quickly). PH stays between 6.8 and 7.0.Any theories on what is going on?
