He has been In store where maintenance isn't the best for months, probably no WC schedule tbh, you know what stores can be like.
I'm sure time will tell on the true id.
I believe theres a local of normal nats that are yellow...
He is wild caught either way so I'm guessing would be more aggressive anyway.
Besides all this I'm happy with him, beast of an attitude. I've missed pirahna, just gotta move some fish out of the 90g soon and he can go in there and the wolf will get his tank back.