We had success with the banana - well part success, but I hope they got enough of the dosage to make them feel better. Lukaku is eating and doing poo fine, he is just sleepy, but seems okay. Onana continued to refuse to eat and did no poo. I tried all fifteen minutes or so to feed him something, while in the meantime returning to my desk and trying (in vain) to get some work done. I had closed Lukaku's cage, but had not bothered to close Onana's. It didn't occur to me because I am so used to letting them open. And he was anyway just hiding in his hut ...
And then I turned around and there he was!
I didn't know what to do. Chasing him back in seems more stressful to me than just letting him slowly hop around. What he did was laying down next to the dividing fence to be near Lukaku as he always does. I let him in peace for a while, then tried to feed him some dandelion, which he ate six very little leaves of. And a bit of hay. Not much. But enough to hop back to his toilet and do a small poo. It is still worrying, he eats next to nothing, and the poo doesn't really amount to much. I will count that as a good sign, though. I am supposed to phone the vets again this afternoon and hope there is some further improvement in the meantime. Thank you all for your good thoughts and vibes and wishes!