Howdy,
Pretty new to the hobby, please be gentle. I have a Betta that we got from the pet store about 3-4 months ago. He would generally sit on the suction cup holding up the heater when nobody's around, but as soon as you went anywhere near the tank he would follow you around. Would play with you with a ping pong ball.
About a week and a half ago I picked up 3 neon tetra to give him some company (only a 5 gallon tank so I didn't want to add too much), and the guy at the store sold me some wisteria that had already been growing in water. Waited a few days to see if they were doing fine in the small 3 gallon quarantine tank I had and then moved them in. Everything seemed fine until yesterday. I noticed part of one of his fins almost looked like it folded/rolled into a straight line. The tetras seem unaffected. Did about a 40-50% water change and gave it the night. Today that fin and another are exhibiting the same symptoms and much worse than the day before. He's spending almost all of his time laying on the bottom and is hiding in his cave a lot, which generally he would never do. He's coming up to the top occasionally but his swimming does appear labored.
We were using API test strips previously but ran out, went out and picked up an API master test kit today and checked the water we pulled out yesterday and the water that's in there currently. Both are pretty close:
Yesterday (using the master test kit)
7.6 ph
.25 ppm Ammonia
0 ppm Nitrite
5-10 ppm Nitrate (although it looked much higher on the test strip yesterday)
Today
7.6 ph
0 Ammonia
0 Nitrite
20-30 ppm Nitrate (strange that today's is showing more nitrate than when I tested last night's water. It had been about a week since our last 25% water change).
The master kit doesn't appear to test alkalinity, but the last time we tested with one of the strips it was about 80 KH ppm.
I'm setting up the quarantine tank again after giving it a good rinse. Using all fresh water with some Microbe-lift XTreme to condition the water. We're on a well, no chlorine has ever shown up on one of our test strips. I'm not really sure what else to do. I have a small heater I'm going to put in that tank as well to keep it warm.
I'm in Canada, so access to fish meds is limited. This is actually my 2nd Betta. I had one about a year ago that passed as well after a few months. I was given melafix and primafix, also bettafix. I didn't use the betafix with the other two. I have not used anything on him yet as I think it was how I used them last time that may have made my previous betta worse. I also have aquarium salt, but am not really sure how to properly treat him with that either. I remember when I was trying to figure it out last time I was reading conflicting information and ended up not using it because I didn't feel comfortable without knowing what I was doing.
Was pretty bummed after spending so much effort trying to save the last one, I didn't look at fish for about a year. Watching the poor thing suffer just killed me. Thinking I probably shouldn't have bothered trying again. I can't seem to keep them healthy. Any help with saving this poor soul would be appreciated.