Welcome.
Their teeth constantly grow so they need hay to get their teeth down. So, hay is something they should have without interruption. They should have some pellets.
My Finn and Lara get veggies three times a day, for breakfast lunch and dinner. They have separate cages and I feed them exactly the same amount each. I feel they get their vitamins from veggies so I give them plenty of veggies to cover their vitamin needs. Fruits are given as treats so not too often due to high sugar content.
I am more proactive when it comes to their health and I prefer veggies over vitamin pill form. Giving them everything they need to thrive should cut down issues later on down the road, which means less trips to the vet.