Hello! Just joined this forum I’ve been apart of fishlore (another forum) for over 5 years but this disease i’ve been dealing with has everyone stumped. 20g, 1 common goldfish, no other tank mates. She’s over 6 years old. 20g tank has been cycled and set up for years. I do weekly or biweekly 25% water changes with Seachem Prime to dechlorinate. Water levels are good. Nitrate was 5ppm a couple days ago before I did a weekly water change.
The issue-
Since December of 2021 she has had red streaks show up on her upper tail fin. At first I increased water changes. A red spot showed up weeks later on her abdomen and then disappeared over night. More red streaks sometimes appear on lower half of her tail fin but not too often and again, will disappear overnight or within 48 hours. The red streaks on the upper tail fin have not disappeared and after dealing with this for so long, I’m not sure if it is permanent. We obviously suspected hemorrhagic septicemia at first. Treated with Kanaplex in the tank and then when that didn’t work did medicated food w Kanaplex for a couple weeks. Didn’t notice too much change. No new spots appeared. It’s been over 7 months and hemorrhagic septicemia, from what I’ve read, kills quickly. Next we suspected Nitrate poisoning but I had already increased water changes… problem didn’t go away. I noticed the upper tail fin streaks get brighter kind of which happens sometimes so I went back to the forum and decided to do a methylene blue bath. She sat in a solution of 1/4 tsp methylene blue with 2 gallons of water for 30 minutes. Didn’t do anything or improve condition but, it really stressed her out with the netting and everything that she’s been nervous/scared around me ever since. I’m just giving her time so she knows I don’t plan on doing it again.
So, if not hemorrhagic septicemia or nitrate/ammonia/nitrite poisoning… any ideas what this could be?
BTW I’ve also added aquarium salt various times and that did nothing.
Here is a picture from the very beginning.
The issue-
Since December of 2021 she has had red streaks show up on her upper tail fin. At first I increased water changes. A red spot showed up weeks later on her abdomen and then disappeared over night. More red streaks sometimes appear on lower half of her tail fin but not too often and again, will disappear overnight or within 48 hours. The red streaks on the upper tail fin have not disappeared and after dealing with this for so long, I’m not sure if it is permanent. We obviously suspected hemorrhagic septicemia at first. Treated with Kanaplex in the tank and then when that didn’t work did medicated food w Kanaplex for a couple weeks. Didn’t notice too much change. No new spots appeared. It’s been over 7 months and hemorrhagic septicemia, from what I’ve read, kills quickly. Next we suspected Nitrate poisoning but I had already increased water changes… problem didn’t go away. I noticed the upper tail fin streaks get brighter kind of which happens sometimes so I went back to the forum and decided to do a methylene blue bath. She sat in a solution of 1/4 tsp methylene blue with 2 gallons of water for 30 minutes. Didn’t do anything or improve condition but, it really stressed her out with the netting and everything that she’s been nervous/scared around me ever since. I’m just giving her time so she knows I don’t plan on doing it again.
So, if not hemorrhagic septicemia or nitrate/ammonia/nitrite poisoning… any ideas what this could be?
BTW I’ve also added aquarium salt various times and that did nothing.
Here is a picture from the very beginning.