He hasn't got a litter tray as such. As a house bun I left him to go in his one place in his cage so that he didn't spray in random places and now I don't want to interfere with his placings. He has his corner in the cage so I can put mega zorb there and then put a mixture of hay and wood shavings to create a soft bottom. I'll still use newspaper as it adds that bit of protection from bacteria etc
Putting a litter tray in the corner wont upset his habits you could get one of those corner ones if you are worried. Theres no need for one if youre cleaning that corner out every day anyway but would reduce mess and cleaning time a lot.