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- Anonymous9 years agoFavorite Answer
bad water quality. do a big water change and use prime for a declorinator. stress can cause color loss
- ?Lv 79 years ago
Fish loose color down to many things .Not kept at the right temperature .So do you have a heater .
Also poor water parameter's can cause a fish to loose color as well.
So my advice is check water parameters and make sure you have a filter and heater in the tank .
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