Blind neon cardinal?

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Mash

Aquarium Advice Apprentice
Joined
Nov 25, 2013
Messages
15
Location
Hertfordshire, UK
I have a 3 week old 180 litre tank with a juwel 3.0 filter @ 600 lph. I have planted it, it is cycled and ammonia is 0, nitrates 0, nitrites about 40, but that is normal. My old tank I had for about 2 years was always that level. I transferred all my fish across 3 green tiger barbs, 3 yoyo loach 6 lemon tetra, 6 black tetra and 6 neon cardinals. 2 bristle nose Pleco we're added yesterday.
Today I notice 1 of the neon cardinals swam in to one of the anchor lines for my floating moss balls. It appears to have white eyes where all the others have bright black eyes. Help!
 
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