Cayuga

[Kayuduck]

Hello, my Cayuga has a yellow tongue. What could be wrong? He's not eating as much. My old runner or runner mix which is much bigger than the Cayuga, decided to try raping the Cayuga and not sure if he actually did.
I separated them immediately.
He's been different since
Any help is appreciated

 

[sourland]

How long ago did that happen? It is possible that the larger drake injured the Cayuga.

 

[Kayuduck]

It happened a couple weeks ago. The Cayuga looked ok until recently. He looks sad. I'm thinking of getting a second cayuga so he's not lonely but not sure if second cayuga will be aggressive or friendly to him.
My first concern is the yellow tongue. I do give them green lettuce which they love for snacks. They eat duck pellets, pen super clean, water clean...

 

[Canadian Wind]

Do you have any pictures?

 

[Kayuduck]

I'll try taking some