I've never experienced this so I'm wondering if anyone here has. My friend's betta is losing all of his color. He's in a 5 gallon cycled tank, filter and heater. She does the 35-30% weekly water changes, adds Prime conditiner. His diet consists pretty much of pellets (i think Wardley).
She's only had him for about 7 or 8 months so I don't think age is a factor.
I had her test today and ammonia 0, nitrIte 0, nitrate between 5 and 10, ph 7.6
25% weekly water changes with gravel vac.
He's normally a beautiful deep steel blue color. The only issues lately have been with the heater malfunctioning. It was actually overheating the tank and the temp was up to 86 at one point. They unplugged the heater until they could replace and the temp range is back to normal (for about a week now).
And the were without a bulb in the hood for about a week before that but he's in a kitchen so would have received some ambient light in that time.
He's losing all color in his dorsal fin and the rest of his body is fading too. He's eating and acting normally.
I'm stumped. Any ideas?