Columbian Shark turning darker

Shadow645

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I have 2 Columbian sharks (approx. 4-5” each) in a 200 gallon tank along with a silver arowana (approx. 9-10”). This is a temporary setup and will be putting the arowana in a 2,000 gallon custom tank once it’s finished so I can switch the sharks to brackish.

My issue is that one of my Colombian sharks has turned a darker coloration then previously or compared to his buddy.

This change occurred about 2 weeks during which he was still eating and acting normal.
However today when I fed them he seemed disinterested in any food, unlike his buddy.

I feed frozen blood worms and hikarI carnivore sinking pellets. (I’ve tried a range of shrimp to which both sharks show no interest.)

I am not sure if they need a brackish shift now or not as I am only told that they can stay in fresh while they are young.

Any information would be helpful these guys were the first fish I bought and would absolutely hate to lose them.

Thanks, Chris.
 
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Shadow645

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Apologies I forgot to mention that I cannot have my water checked until the morning however I had it checked twice over 2 days ago in which both results showed excellent water peramiters.
 

UnderwaterGalaxy

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They most definitely do much better in brackish water. You should see instant change in behavior once you put some salt in. They are more calm in brackish water.
 

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