Black Kuhli Loaches- Sick or Stressed? Pls help!

[Kimbereally]

Hello, I have had 7 orange striped kuhli loaches for a little while now and decided to get 2 black ones from PetSmart to accompany them. After putting them in the tank I noticed that they seemed overly energetic, but its been going on all day to the point they seem erratic and I don't know how to help them. My ph, ammonia, and nitrate levels are great and my other loaches and fish have no problems or weird behaviors. Are they maybe sick or are they maybe stressed from being in a new environment? They're fairly big so maybe they've been in captivity for their whole lives and aren't used to being in a bigger environment? (I have a 40 gallon tank). I'm just worried that maybe they'll hurt themselves or maybe thir little hearts will give out or something. What should I do?

 

[DoubleDutch]

To me there is nothing to worry about.
I've got 5 of these buggers and they recently move to a bigger tank.
Now and then they think they are competing in the Formula 1.
They'll settle down !

 

[Kimbereally]

To me their is nothing to worry about.
I've got 5 of these buggers and thwy recently move to a bigger tank.
Now and then they think they are competing in the Formula 1.
They'll settle down !

Thank you! )