Oo thanks I'll be saving that one.
You can certainly offer a mineral lick. Most of our buns would get the salt and minerals needed from pellets. But he would have to actually use it, always worth a shot. I wouldn't offer it right away, would wait until you have his hay/herbs steady then offer it so youll know if its the lick upsetting his tummy rather then the new introduction of the cilantro. Just watch as some bunnys have no self control with their salt licks.
Alfalfa is one of the lower NSC level hays available and Zero not being able to handle that made me think maybe its the opposite for him (which would be bizarre) but alfalfa is also super rich in protein which oat/barley hays aren't...
Hes going to get more protein and calcium for growing from items like Alfalfa or a juvie pellet.
http://www.guinealynx.info/hay_chart.html
Hes not having issues like founder or Epsm... its just what his gut can handle... so its really hard to say what is best for him.
I pass these bunnys that live off the side of the highway in a spot no bigger then 30x70' if that, and all they have to eat is grass and whatever weeds are growing there. If they can grow up big and plump and healthy, I'm sure Zero will do just fine on whatever we can get into him that isn't pellets.
We can try hays that are more substantial then Timothy for bulk and possible change in protein/minerals/calcium (like oat/barley) They may not cause issues because their not as rich in protein, but yes they have more NSC then Alfalfa (win loose?) (being able to switch his hay may help build his tummy better so its not just used to the same thing and gets lazy) Try the salt/mineral rock. Keep a slow herb introduction with Cilantro being number 1. And I think once hes off the meds and his body learns to cope with out them, and builds up its own natural gut flora, he may be able to tolerate other stuff much better.
Sorry, this goes back to that tone thing, I don't have an organized thought process so stuff comes out... like this ... not making much sense at all.