I had a threadfin anthias in his quarantine tank for two days. Everything fine but today i saw him coming to the surface and spitting water( or gasping if i say it) every now and then. It still reacts promptly towards my actions making before him. I can only say i faced the same situation when i unpacked the new coming fish in serveral cases( however this symptom alsways diminished just after they went into the tank) . But anyone could tell me the reason for this behaviour? I think there must be something wrong that i'm not aware of.