My white female betta is showing pink streaks in her tail and a white patch on her belly. This has all developed over the last two weeks. Ammonia and nitrite have been 0 and nitrate is around 5. The tank was cycled before she was put in so she’s never been under stress from ammonia and I use Stress Coat to dechlorinate. Is this indicative of an issue or could it be innocent color changing? I’ve had her for about four months now.