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They look about the same size. The female could be bullying him and or taking his food. I would watch and make sure he eats next time you feed them. Maybe try shop feeding. Have you tested your water parameters?
He is very skinny and obviously dying. I can't tell why from here.
How long have you had them? If they are close in size they will bully each other..she may be big because she isnt letting the other eat