I had to abandon using pellets for litter. Marvin was peeing everywhere around the litterboxes, but not inside, apparently he has something against the pellets
. Jessie on the other hand picked it up right away and only a couple of times did I have to pick her up and put her in the litterbox before she peed on the carpet. With Marvin being so skittish each time we thought he was going to pee would end up with 5 minutes of chasing him around the house. Of course at that point he is mad/annoyed and is likely to pee outside the litterbox out of spite. Plus with them being in their pen for 16 hours a day while we sleep/work there would be no way to stop him from going outside of the litterbox.
so I have had to revert back to shredding newspaper and using hay for litter, but havent had either rabbit pee outside the litterbox in almost a week. However Jessica no longer likes where we had been placing the litterbox and has taken it upon herself to move it into the middle of their pen.
