Yeah, roughage 24/7. Hay, hay, hay and more hay, with more hay after that hay.
When my guy had ulcers, my vet had me put him on a full dose of GastroGaurd. And then, when I completed the ful dosage, I put him on SmartPaks SmartGut Pellets.
I've had him on a Round Bale, 24/7 also, which has helped immensely. No more ulcers, I've been able to take him off of the SmartGut Pellets. He stays on a round bale, because the more hay intake they have, the better for their digestive system and the less chance of an empty belly to cause ulcers.