Veggie feeding is more aligned with a rabbit’s age than weight. Wick is only 1lb and some change, so he’d be quite devastated to hear he’s too small to eat veggies!! If I remember correctly, your rabbits are older than 7mo or so, so it should be fine to feed a small amount of veggies daily. The delay in age is so a rabbit’s gut and gut bacteria can get strong enough to digest veggies.
My vet recommended sweet potato (I think) if Wick was fussy with CC. He didn’t end up needing it because he loves it so darn much though. I don’t see why a small, small, grinding of banana would hurt— just always be on the look out for too much sugar from the fruit. Do you have the apple & banana critical care? That’s the flavor I had and it was very fragrant of sweet fruits.
As for the hay, it sounds a bit logical that Bombur wouldn’t want hay at the moment. It’s not as tasty as veggies, and it’s a lot more work to eat hay. Keep presenting fresh out of the bag hay if he rejects some for a day; that way, when he’s feeling it, he won’t reject the hay for being old and sitting-out for a long time.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.