XB not eating after moving to black tank.

[mnhash]

Hi all,

My XB was transferred from my 622 because it was attacked by my Kingdom red.

Initially put in a bare tank with no oyama and was eating well. But I noticed that he's always looking down so I decided to oyama the tank to avoid DE. After putting 4 side black oyama, I realise he no longer eating.

Does black tank affect an arowana to the extend to not wanting to eat? Use to eat BF, MP, SW. Now everything also never touch. Could it be he can't see?

Water parameter checked and all is good, in fact water was taken from the 622 where the arowana was taken out from. Arowana not sluggish, swimming actively, still comes to greet me when I put my hand.

Any sifu here can advise?

http://youtu.be/rw8MM2ZE7JM