Rasbora help, 1 dead, 1 iffy

[Coralreef92]

Hi, new here. Yesterday I purchased 4 Rasboras, a 5 gal. Tank, and everything I needed to set up with assistance from the workers at petsmart. On the 10 min drive home 1 had already died and I thought maybe it was due to stress so I set up the tank and let the others adjust to their new home but upon closer inspection I noticed one had a curved tail and was swimming oddly. I will post a video so you can see. Is this a problem where I will have to remove him? Is he sick? I plan to buy a few more along with some plants so they can be more comfortable after doing research on what they like but I don't want any others to get sick if he is ☹

 

[Colin_T]

It looks like it has been poisoned or injured.

If the fish died in the bag, then contact the shop and complain to them. They did something wrong when catching the fish.

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Check the ammonia, nitrite, nitrate and pH of the tank water.

Do a 75% water change and gravel clean the substrate.
Make sure any new water is free of chlorine/ chloramine before it's added to the tank.

Increase aeration/ surface turbulence to maximise oxygen levels.