Red tail shark not usual self

[Mainsey93]

Hi,

I’ve just moved my fish into a new 125l tank about 5 days ago. All fish have settled in perfectly well apart from my shark. It is is spending most of its day hidden under the rock and isn’t eating. Today I noticed it was flicking a little as well. There is no visible white spot or fin rot and it isn’t excessively breathing. The ammonia, nitrate, nitrite and other water parameters have been monitored everyday and are perfectly fine. I did see it had something stuck in its mouth 3 days ago which was long and thin and white in colour but I had fed them some frozen food which resembled that. After an hour or so the white thing had disappeared.

However, I’m not sure if that food being stuck in its mouth was a parasite or if the food being stuck in its mouth has stressed it out. Any help or suggestions would be appreciated!

Cheers!