Hello! I have two oranda goldfish in a 29 gallon tank and one of them is sick. His fins are flared up and red and they have black on the tips. There’s also a black spot under his tissue crown. The other oranda is perfectly fine and doesn’t have any of these problems so I know its not ammonia burns. Ammonia, pH, Nirtrite, and Nitrate levels are all at healthy levels. An employee at Petco told me he probably has a bacterial infection so they recommended using Melafix for 7 days with no carbon filter. After the water change, he still looked the same. I went to Petsmart and they also said he has a bacterial infection and recommended using Artemis Microbe-Lift for 10 days. I did that and he’s STILL not showing any signs of getting better. He’s still eating, he’s very enthusiastic about eating, so I figured that’s a good sign. In the morning both fish swim around the tank but then the rest of the day they just huddle together at the bottom of the tank and sit there. I’m really worried he’s really sick and I feel helpless that I don’t have any solutions. I would love if anyone could give me some answers, thank you!