Hey guys I'm rather new with Balls, have only about 6months of experience.
Recently I purchased one more and the guy who sold it to me kinda disappeared. Apparently its been fed mice all its life.

My ball (he) is nearly 3ft and just over a Kilogram, but has not eaten since I got him in end Jan, tried mice of all colours, sizes and even live mice. I'm pretty sure of my husbandry since my other 2 are eating. I know it can be attributed to possibly the breeding season.
But there was this once he pooped, and it came out quite watery, I did read somewhere that it can happen when a ball goes off feed or changes food type. Is this true or does it sound more like some internal parasite that is causing him to reject food?

Thanks