I have had my grunge in for 1 month now... and I have seen 2 TINY red worms, I THINK spaghetti worms in the sand, and... um... thats it. Oh.. I have seen a few tunnels against the glass.. maybe 3, and one of them was developing before the grunge!
I have seen some pods, or what I think are pods... I kinda thought pods were bigger. These things are tiny. Probably about 1/4 the size of this punctuation.... . TINY
All in all I wasnt impressed with what grunge did for my tank, and was certianly disapointed in the mess, and loosing my nice white sand!