Hello all. About a couple of weeks ago I lost one of my goldfish to what I beleive was septicemia. She has red streaks all over her fins and tail. She didn't show any symptoms until the day that she passed away https://www.fishlore.com/fishforum/...-help-something-really-wrong-my-goldfish.html Shortly after she died another one of my fish started to act weird and wasn't eating. I thought that he had the same thing so I put him in my QT and treated him with maracyn 2 for five days. After the treatment I kept him in there for an additional few days to see if he was ok to go back to the main tank. He was back to normal, therefore yesterday I put him back in the main tank. Now another one of my fish is starting to act strange, Shortly after I put the other fish in the QT, I noticed that this fish had the same streaks ke the other fish that passed away did. Beleive me, these aren't vains, they are streaks. He still eats and moves around, but he seems like he is getting worse. He just kinda lazies around looking like he isn't feeling well. He has several on his tail and one on one of his lower anal fins. I tried to get a video of it, but I am not sure if you can see them or not, but they are there. He still eats so at least I have time to figure out what is wrong with him, but I fear that this won't go away and he will progressively get worse. My tank is as follows: My aquarium size is 55 gallons. It has been running for about six months now. I have four filters on the tank: one aquaclear 70, whisper 50-70, powerhead with sponge, penguin biowheel for 50 gallons. I do weekly 50% water changes. Last water changes was Sunday I changed 50% of the water. There are currently four four inch goldfish. I use amquel plus and aquanova plus. I have been feeding them hikari lionhead pellets twice a day. Brine shrimp twice a week. My current water perameters are: Ammonia: 0 Nitrite: 0 Nitrate: 15 Ph: 7.2 Here are some photos and videos: [video]http://s1048.photobucket.com/albums/s366/tayjay76/?action=view¤t=sickfish001-2.mp4[/video] Let me know what you guys think.