Worm casts on patio
We recently moved in to a new house (new build).
In the garden there is a patio area of about 2m x 2m which is constructed from the same pavers as the drive at the side and front of the house.
On the patio we are seeing a significant number of worm casts appearing above the paver joints - although they do not appear on the drive,
I am concerned that the worm activity under the patio may cause areas of it to sink over time and wonder if there is anything I can do to discourage them from that area.
I would mention that the rear garden is quite a small area and is gravelled rather than grassed.
Any suggestions would be greatly appreciated.