I got a new bunny today called muffin. Please give any tips 😁

okay so I know the basics. 80% hay diet making sure they always have access to it, keep him indoors and neutered, he has a 24sqft play pen not a hutch with loads of cardboard a litter box etc etc. before we adopted him he was in the shelter for a year because nobody wanted him as he didnt use a litter box no matter what, I’m okay with cleaning up after him the only thing I’m so so panicked about is gi stasis. so if anyone can tell me anything about that that would be great 😁