I have only had my Betta a week now and he was at first pinky purple and now he has change colour -more purple. The first 2 pictures are of the betta at the fish shop just before I got him. The next 2 pictures are today. Would too much light cause this?? Should I be worried? Usually he has plants and branches to sit on and has a heater at 23*c -just in a small bowl that he was in when I first got him because his tank wasn't quite ready and also to observe him better.
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