I've had planaria and nematoda in the gravel of planted tanks before... They tend to show up when there are dead spots with rotting food for them to munch on.
As much as I loved my aquascaping, I knew I had to dislodge pretty much everything and vaccuum that sucker well.
As much as I loved my aquascaping, I knew I had to dislodge pretty much everything and vaccuum that sucker well.