Black Phantom Tetras weird behaviour

[sallyavory]

Hi, Does anyone know why my three new Black Phantom tetra spend all their time with their backs to each other, staring out of the tank? I bought them three days ago, and in the shop they were in a large group and all very lively. My other fish are: 1 guppy, 2 zebra danios, and four little blue neons, and the BiOrb that they are in has been fine for all the fish for about 5 months now (although one guppy died the day after the new Phantoms arrived) I partly changed the water after the death. The water test says all is well, so is it just a behaviour thing?

 

[Doggfather]

wrong forum, belongs with cyprinids and characins

 

[sallyavory]

Dear Mr Doggfather:
Thank you for pointing out my mistake, I would delete the question but I don't know how!

 

[Phantom Thief]

Give em a while more to settle down, they'll be fine.

P.T.