BrightOrange 0 Posted October 10, 2020 We set up a new 75-gal tank two weeks ago for our 3-yr-old, 9-inch comet goldfish, 3-yr-old, 11-inch pleco, and 20 glofish Danios. Tank has live plants and two filters, one rated for a 75-gal tank and the other for a 125-gal tank. Water test shows: 0 Nitrate, 0 Nitrite, 75 GH, 0 Chlorine, 80 KH, and 7.6 pH. Water temp is 76 degrees. Two days ago, my goldfish and my pleco stopped eating and became lethargic. A few times, I saw the goldfish flashing himself against the gravel in the tank. Yesterday he developed red, irritated-looking veins on his fins and tail. As you can see in the photos, his fins are now very red. I suspected ammonia stress and did a 25% water change last night, and another 25% water change this morning. The Danios have been completely fine the entire time, showing no symptoms of stress. Should I relocate the goldfish (and the pleco?) to a different tank, or just continue with water changes? 0 Quote Share this post Link to post Share on other sites
BrightOrange 0 Posted October 12, 2020 Okay so I ended up moving the goldfish to a hundred gallon stock tank outside and he is already looking much better. The redness on his fins is fading and he is much happier out there. I guess he just wants to be an outdoor fish. The pleco also seemed to improve after I relocated the goldfish, but then I noticed a few of the Danios developing ich. So now I'm treating the 75 gal tank for ich. My guess is that the ich made the goldfish injure himself by flashing against the rocks, which caused the bloody fins and tail. His fins and tail also look a bit ragged. I'm hoping they will heal. 0 Quote Share this post Link to post Share on other sites