Hi Casie.
I wish your bunnies a speedy recovery. We had our Flemish Giant fixed within a week of getting her. As I understand it, the concern is that
rabbits need to eat every three hours to maintain proper digestive function. If they're eating and pooping, they're fine in that respect.
Whatever you're feeding them, be aware of calcium levels, although I bet your vet already told you about that. We tend to feed our girl lots of romaine lettuce as a green treat she can eat comparatively lots of (I usually give her three outside leaves, and if I give her four, it usually just sits there until she's ready for it).
As to treats that are also good for her, we started with mango slices we dried ourselves, but switched to papaya when we found out that an enzyme in papaya stops bunnies from getting what is known as "fur block," analogous to a cat's hairball, and created in the same way (grooming), but rabbits can't vomit, so must pass it like everything else.
I don't know what guidelines you were given, but the general feeding advice we have been given for our girl suggests no more than two tablespoons of any sweet fruit treat per six pounds of bodyweight, and to keep
hay and pellets constantly available. They are apparently only prone to overeating in the case of sweet treats.
Other than that, I don't think there's a lot you can do but make sure they can access everything they need. Oh, and you probably know that rabbits are coprophagic, meaning that they eat their own
poop. They have two different kinds, but if you've been cleaning up all the poop you see, you might want to hold off on that. In addition to giving their digestion another shot at breaking down what didn't go on the first round, they also reintroduce gut flora, a bunny probiotic.
I hope your bunnies recover swiftly, and may their binkies let you see their thanks.
-CK
A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
-Robert A. Heinlein