Can anyone ID this tiny red creature?

[Danmuges]

Found a few of these red things underneath some of my frag plugs. Any ideas what they are. They slide off with my finger nail. They are soft and break apart easily.

 

[loweryphil]

Found a few of these red things underneath some of my frag plugs. Any ideas what they are. They slide off with my finger nail. They are soft and break apart easily.

Sps frag plugs? If so, Red bugs. Bad.

 

[Danmuges]

Zoas. Haven't got any sps in the frag tank

 

[reef lover]

Flatworms .....

 

[Danmuges]

It's not flatworms