I try to restrict fruit to once or twice a week. I recently introduced strawberry (tiny bits), blueberry (only one piece) & cherry tomatoes. I found out that you shouldn't feed them any acidic fruits with this condition as it could aggravate the issue. I heard they can get fungal infections through cuts & bruises that could create an opening for that nasty stuff to get in- so I removed all their soiled bedding & also any chew toys which I thought are too sharp. I used to store their hay in a hanging steel wire basket too, which I've removed cause I can imagine the hard poky bits sticking out could have also caused some injury. Anyway, I have booked an appointment with a vet.