dark color

It has been a month since I have got his. He had good Red colour. Now he had turned REALLY DARK, I assume it is because for the inappropriate WATER TEMPERATURE. I have bought a Thermometer from the Local Fish Store and was using it, the water was cold (an approx of 23c or less) I blindly trusted...

I recently made an upgrade for my p.bass and built him a 750g pond outside. When I moved him in he had completely normal coloring for a few days but now he has turned almost completely black with only a few spots towards his tail end remaining. The water quality is pristine (0 ammonia 0 nitrate...

My flowerhorn is about 3 inches now. It will be 3 months old this coming Nov. 10. I transferred it to a bigger tank two weeks ago. Since then, its color turns darker and darker everyday. He is very aggressive though as always. Eats a lot as always. And plays around the tank (goes up and down and...

My flowerhorn is about 3 inches now. It will be 3 months old this coming Nov. 10. I transferred it to a bigger tank two weeks ago. Since then, its color turns darker and darker everyday. He is very aggressive though as always. Eats a lot as always. And plays around the tank (goes up and down and...

I've had 2 Turqoise discus in my community 125 for about a week and a half. When I first saw them in the pet shop they looked like they had much more color and I could see the red and blue in them both. Since taking them home they've been a very dark color, almost a brown with almost no visible...