Is it better to use green earthworms or black earthworms for underground cages?

Black earthworms are best. Compared with black earthworms and green earthworms, large coarse black earthworms have a stronger odor, but do not smell so bad, so they are more suitable for underground cages, while green earthworms have a lighter smell and are not attractive to fish, so black earthworms are better. It should be noted that the floor cage must be straightened. Once the first end is attached, the floor cage should fit flat without twisting. It must then be forcefully straightened until it reaches the other end, so as to maximize. space. The floor cage is fully utilized, and the space inside the floor cage is also fully displayed.