Red Claw Crabs turning darker color

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cornflakes

Aquarium Advice Apprentice
Joined
Nov 12, 2013
Messages
48
One of my RCC seems to have turned really dark in color....almost granite / midnight greyish. He's usually a light brown but I'm wondering if there is anything to be concerned about.

Also a little update on my tetras that came down with ichs. After about 3 weeks of raising the water temp to 30 degrees celsius (84-86 F) and doing 25%-30% water changes every other day, 2 have survived and look good (no signs of any white flakes) and are doing well now. 9 didn't make it.
 
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