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If the others are breathing normally, I would suspect gill flukes (or perhaps a gill infection) making it harder for the affected fish to obtain oxygen. Low oxygen in the water is likely to affect all the fish of a species equally. I would try treating for flukes.
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I would reduce the lighting to start with. Brown algae (diatoms) usually go away after a week or two; people can give any advice they like and it will always seem to work. :)
I would also add more plants, especially fast-growing stem plants. Algae seem to have a hard time when there are lots of...
Zero nitrate is not a useful goal.
Happy and healthy fish is a better goal to aim for.
Fish like space to swim around, the choice of interacting with their tankmates or keeping away from them, and a rich environment to live in. No amount of filtration will add that to a tank that is too small.
Are we talking about the brown patches on the Amazon Swords? They don't look like diatoms to me, more like damaged leaves. Can you remove the brown patches ny rubbing the leaves?
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