Flatworms?

[SpaceInvader98]

Been away from the tank for some while returned to see a lot of these on the glass and some on sand bed, corals still look the same and happy with good growth.

 

[lapin]

If they move then .....looks like flat worms.

 

[KJ]

Been away from the tank for some while returned to see a lot of these on the glass and some on sand bed, corals still look the same and happy with good growth.

Flatworm Convolutriloba sp.