I have 3 African geese that are 2 weeks old. I've been letting them have some grass every couple days and my question is about grit. I can get sand where I work, coarse and fine. I'm thinking coarse is better. Do you just put it separate in a pan off to the side?I'm worried they'll lay into it and just get a belly full of sand,can't imagine that being good for them.What do ya'll do?