Snail or ???

[Steve 926]

Hello to all
Found these in the display today while cleaning & a WC.
Any idea what they are ???
Friend or Foe ??

Thanks for a reply

Steve 926

:smokin:

 

[650-IS350]

Flatworm... but don't know wether its reefsafe or not

 

[LeslieH]

They'[re acoel flatworms, micropredators which eat copepods. Harmless.

 

[Steve 926]

Thanks for the reply's

How do they just appear in the display, as a hitch hiker ?
Can they become a nuisance & multiply out of control competing for food with a Mandarin, or other copepod predators.
If so, what 's the best recourse.

As Always
Thanks for a reply

Steve 926

:smokin: