Are my fish ok, one is not growing?

Kitty

New member
I have 5 male paradise fish all brothers. They all have their own territories and occasionally nip at each other but their fins are not damaged their colours are fine and they are healthy.

But one of them isn't growing, ive had them since they were young and have never injured each other but he is not growing, i watch them as they feed and he gets enough food and eats well but hes tiny and pale. He shows no sign of illness just not growing and discolouration.

What could be wrong with him?
 
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