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They look hungry to me. I think you have to feed them.
Nute burn has a much more burnt look to it, more acute than hunger- which is more washed out and tired looking - the all over yellow like you see.
The other option is that they have enough food, but can't use it because of nutrient lock out caused by an f-ed up ph. Do you ph your water? I'm leaning towards underfeeding though.
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