This is strange. We got up this morning at around 5:30am, and my wife went over to say "good morning" to our fishy. When she turned on the light, the fish was pale in color and not really looking like she was responsive. She was kind of behaving a little derpy. My wife said that she was laying on her side on the bottom leaning against her tank decoration. My wife said she was almost cream colored and seemingly had no energy at all.
I quickly did a test of the PH, Ammonia, and Nitrates and all three came back perfectly fine.
Then, when I went back to the tank five minutes later, considering doing a water change anyway, I see that the fish is swimming around. Her color is back. She seems fine.
What's going on? Do these fish color change that fast? I have no idea what stressed her. Her tank is clean, her water temperature is fine.
Do any of you have any ideas?