@Julbra @vetteguy53081 here is an update. Please tell me if you think it will get better.
The YWG is not surfing the glass, but it’s being chased by the Allen’s damsel (a generally pacific damsel, unlike most of them). So it’s staying high up in one corner of the tank, slowly moving it’s tail fin to stay in place.
I used a long pipette twice to gently make him move to the ground. And it does, but it stays in plain sight instead of hiding in the multitude of caves in the rocks. So the damsel sees him, chases him and he goes right back in the corner.
This must be very tiring and I don’t think he can last days like this. This morning I made sure to put food near him and I believe he ate. So that’s good.
I’m not sure rehoming is a good option, as the same thing will likely happen in any other tank. I only have 6 fish and they are mostly nice. He just doesn’t have the reflex to hide. It seems like he is not capable of adapting to aquarium living with other fish.
Having another tank just for him isn’t an option. What should I do ?