Iridescent Shark in chasing?

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helptoall

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Joined
Sep 6, 2018
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Hi, this behavior started this week , the big one is chasing the little one. they live together for almost a year and thats the first time thats happened. its happening a few times a day. Do you know what is this? Is it a game? attack? Mating behavior? thank you
 
Is the water cloudy or is that the video?

The tank needs a picture on the back to help reduce stress.
The fish need a thin layer of sand or smooth gravel in the tank to reduce stress.
You need some plants in the tank and on the surface to help reduce stress. Water Sprite (Ceratopteris thalictroides/ cornuta) is a good one. It floats on the surface but can also be planted in the substrate, and it has very soft leaves so won't hurt the fish if they swim into it.

Pangasius species do best in groups and it's possible one fish has matured and is bullying the smaller fish. I doubt the tank is big enough for more of them but they do best in groups of 6 or more.
 

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