slugs

[ygrowup]

orange to reddish slugs have appeared tonight in large numbers.They are all approx,2mm in lenth and everywhere. The ecosystem has not had any newcomers for at least 5 months and this is the first sighting. The question is are they a form of nudibranch and are they harmful to my reef? Thanks guys for any advice

 

[vibe]

do yu ahve any pics? are they flat at all. if so i would say that they are a flat worm of some kind. i used to get them all the time. didnt hurt anything. just look like plant life ad they speadlike hell.

 

[ygrowup]

they look exactly like a garden slug brightly orange colored and tiny. Under a magnifing glass they have a central organ system in white. sorry wont come up in pic

 

[bang guy]

??