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Bit of an update. All fish behaving fine but the largest (an original from the pond) seems to have the same mark on his side. Still no ammonia registering in the pond. I'm guessing a potential parasite now, I'm going to do a water change and run prazi on it.

Thank you, yeah he was moved to this pond from our old home. I'm a bad estimator of size but he was significantly smaller than the others. (Others were a good 10-15cm he was in the 5cm or less range probably). Two other fish about his size are getting along fine for now. Thanks for sharing...

I feel pretty confident on the ammonia tests given the pond is well established, we're feeding sparingly and the other fish seem happy. I tested ammonia many times (as a sanity check) with it always coming out the same as tap water (quite close to yellow and we use prime, my eyes aren't great...

Here are the pics:

Hey all I recently moved into a house that came with a large outdoor pond. It contained about 12 medium sized goldfish, I brought along 3 smaller goldfish who moved in with them. All good for two months until my smallest one suddenly died (everyone else seems fine).Symptoms...