I would definitely try the MTG. It works wonders. Also try Infusium, Spelling?
The MTG promotes growth, in case you weren't sure.
Okay I have no clue if they sell MTG in Australia, But if I can find it sure thing!
And with the Spelling that is also nt an option, he is a backyard Pony the goes to Pony Club, and things like that. I can not just put him out for Spelling, I don't have a place too, and he get worried and hurts him self when he can't see his friends, he runs through fences.
And I wouldn't speel him anyway, he cna't just go out in a paddock and eat 24/7, when his usual week is 3 days of riding a week if the weather is being my friend.
So I am sorry but you haven't really helped that much, as I already know that I should try MTG there a many people that have suggested it to me!!
Its more than just a PASSION ~ itís a LIFESTYLE