Red Slug/Nudi ID Needed

Squishie89

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Tonight I noticed some BRIGHT red slugs and eggs in my overflow. The only thing I have added recently is a Strawberry Crab, which is quite red/pink. I have no red corals or sponges, only red inverts I have are a fire shrimp, sexy shrimp, halloween crab and the strawberry crab. I believe these to be slugs/nudi's because I can see antenna/eye stalks. My best guess is these critters live on strawberry crabs and either are parasitic or just use the crab as a way to get food. I have not found any of these in the display tank, and only found either 1 slug or 1 egg packet in the sump so far (but the sump is full of bristle worms so that could be a factor).
I took these photos with a special lens for my phone, as you can see by the limpets, spinoid worms and pods, these are quite small.





I know that last picture is dark, but it shows the slug in motion and shows it's tail and head shape (slug is moving towards the right).

I know there is a lot of critters in our tanks, including a lot we don't know are there! Mostly I just want to make sure I don't have a problem on my hands.
 
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