RN's advised is good but I would add one item: put the moss in the bucket and drop some of the shrimpies' favorite food in too, preferaby a type that will sink to the bottom. Prop the moss up to the top of the bucket. (any old stick will do). The shrimp will come out to get the food. Take the moss, pack it up and ship, then pack up the shrimp and send them to me. It is clear you are tragically overstocked and they will suffer DOOM unless they are thinned out.