This is my first full year back in NC. I live in the coastal region of NC and we have very sandy soil. This year I'm noticing large patches in parts of my turf where I have hundreds of quarter sized mounds with no apparent center hole. From what I have researched I think they are earthworm castings. Normally I would think this is great but it appears that the centipede is also receding in these areas and I'm left with sandy/nearly bald patches in my yard. Any advice? Am I diagnosing wrong? Will the turf bounce right back because of all the "good" activity?