Shivering Symptom

[xSparkleZ]

I noticed one of my Apistogramma Cacatuoides twitching, shivering, or gagging in the evening.
I didn't know how to describe this behavior, so I took a quick video which can be viewed below.

Ammonia: 0
Nitrite: 0
Nitrate: 5
PH: 7.5

Only female and male in the tank.
I did dose Seachem Flourish Comprehensive 24-hours ago which is the only new change in the environment.
Fins not usually clamped - only when he is swimming in the current.

Wondering if I should be concerned?

 

[MacZ]

There's nothing wrong. The fish either doesn't like it's reflection in the glass or sees you and begs for food.

 

[xSparkleZ]

That's a relief!
At first, I thought he had something stuck in his throat or something, but I didn't feed him anything yesterday as it was his fasting day.