As any rabbit owner would know, rabbits are plant eaters. They need the roughage in their diets (veggies, hay, limited fruits and supplemental amount of pellets (as adults)). Alfalfa is a no for mature rabbits because it contains too much calcium. Like babies need milk, baby rabbits need the calcium from the hay to grow. As adults they don’t need to grow anymore but they do need a substantial diet. Any hay will do. Some people prefer orchard grass and oat hay over Timothy because of allergies. There are different types of Timothy hay such as western, first, second and third cuts. 1st cut is supposed to be the riches hay a bun can get but other hays are fine too. They have hay mixed with various other things such as lavender, rose hips, marigold, mint etc. you could try some of those to give him some variety. They also sell ingredients like that, known as hay toppers) separately on bunny community websites such as binkybunny and smallpetselect. They love mixes like that and everything’s safe and all natural with tons of minerals and vitamins. Mix things up. They should be happy.