Two of my fish have developed black markings?

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iya.georgee

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I have four fish at the moment, two yellow ones and an orange one (that are all quite small) and a larger orange and white one. The two yellow ones used to be completely yellow, but now they have these brown/black markings. I have read about black spot, and I have never, ever had trouble with that. So, could it be just that they are changing color and it's natural, or could something be wrong? With black spot, i read that it's usually just a couple of spots or just one that measure about 2mm, whereas these spots are more like markings. I've only had them for about a month, and the other fish are fine.
It's freshwater, and I think they're goldfish, but I bought them at the local store and just bought some fish that I liked, that could all coexist with each other. I have a pump in there, and there is lots of oxygen. Everything seems to be fine, the other two fish are fine, it's just these yellow fish, that are about the size of molly fish. But the markings are like a pattern, so I'm not sure what it is, or if it's natural?
 
Is this a reef aquarium? It sounds like you described a clown fish. Fresh or salt water? The most important thing is adequate filtration. You may have a nitrite or amonia spike which can cause severe stress in fish. Ask your local dealer if you have it set up right. It's easier to prevent disease than it is to treat it.
 
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