I’ve been buying my bunnies plain old Timothy hay (Kaytee brand) and now that I’ve figured out that Kaytee isn’t really recommended–I’m not all that surprised, I feel like my bunnies don’t like it very much, they just eat because it’s what I give them–I want to try some new brands!
But, I’ve heard that bunnies should only have plain hay with nothing added? Is that false? I’ve figured out the guy I got my information from isn’t so reliable so I’m not sure what to believe anymore. I also want to get them on different pellet food as well, but because I still have two bunnies under a year (one is six months and one is nine months) I’ll have to keep buying the junior pellets, right? Or can I switch them over to adult? Also, how slowly should I introduce them to the new food/hay? I really don’t want to give them an upset tummy! 
(Again, my pellets are also Kaytee brand).
Thank you so much for any and all help if you can help me
Sorry for the abundance of questions lately, I just want to make sure my buns live happy and healthy as long as possible! 