Headlight tail light tetra getting smaller

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Copachick

Aquarium Advice Freak
Joined
Jun 9, 2011
Messages
392
Location
MD
Hey all!
I have a 36 gallon tank. We have had most of our fish for almost a year now. Lately we have noticed one of our headlight taillight tetras getting smaller and like withering away. We have also noticed that he doesnt seem to like the flake food much anymore, but loves brine shrimp and black worms.
We took water paramiters the other day, but I honestly dont think I remember the exact numbers. Ph was a little low, maybe 6. Ammonia was 0, Nitrite 0, Nitrates were .... one color above zero. (Like I said I dont remember)
Parasite maybe? The rest of the fish are thriving.

Thanks for the advice, if I get any :dance:
 
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