What is this discoloration?

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Rolance

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Mar 18, 2013
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What is this patch on the back of my turquoise rainbow? He isn't looking so hot. ImageUploadedByAquarium Advice1467073271.547052.jpg


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^ this. HLLE has no exact cause as it could be poor water quality, nutritional deficiencies, stress, or parasites. Another theory is activated carbon can cause it.
 
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