What would you say is the best sand to get for my Quails? I want to put it in my run and use it as 'litter'.
Construction Sand VS Brick Sand
Any sand is ok, play sand, sand from beaches or rivers or even dried sand from your garden. Construction sand is ok as long as there are no cement or extremely tiny dust particles. I'm not too sure what you mean by brick sand, is it the red sand used to make bricks? Make sure it wont get hard when in contact with humidity. If that happened chickes might start to develop poop balls in feet...
from my readings in the chicken forum there is a difference in the sand and that a fine sand is not wanted that it could cause impaction.
Brick sand is for laying patio blocks, at least for the bag I have. I felt it was to fine from what I was reading elsewhere. Construction sand has a variety of sizes in it and was what other have recommended.