Ammonia: 0 Nitrite: 0 Nitrate: 5 Tank size: 55 gallons I have been noticing some odd behavior in some of my goldfish. They have not been flashing, bottom-sitting, or gasping at the surface, but every now and then they’ll twitch their fins like they’re trying to scratch an itch. I wasn’t totally sure what to make of it, so I just kept an eye on them but decided it was probably nothing. Today, though, I noticed my newest fish, who I’ve only had for a few weeks, had weird, pimple-looking things on his wen: I decided to pull him out of the tank and examine him, and that’s when I realized that it was more than just a couple white dots, there was actually quite a bit of red, gross-looking tissue around his head: I took tweezers and tried to pull out whatever was inside the “pimples”, then gave him a hydrogen peroxide swab on his infected areas and put him back in the tank. This is what came out of them: It wasn’t moving, but it sort of stayed together too well to just be pus. What is this? Is it parasitic or bacterial? How should I be treating it? On hand, I have Prazipro, Stresscoat, Melafix, an herbal medication that’s supposed to help with various bacterial and parasitic infections, and “all in one” treatment tablets. I feel like it’s worth mentioning, one of my other fish has black spots on her scales. It’s not ammonia burns, and I was worried that it was parasites. But I noticed a few missing scales in that area, so I assumed it was a bruise. Please help, I don’t know what to do. I don’t want to lose any of my babies .