Green slug

[Ody]

I noticed to day a green type slug in my tank it is a lime green colour with three yellow spots on its back its to small to photo anybody any ideas what this is

 

[Armoredspider]

Might be a lettuce nudibranch (sea slug) or a worse type. You should take it out immediately in case it can eat corals. Normally they are the color of what they eat but you can never be sure without a picture.

 

[Ody]

I think it came with some catctus alge I bought explains the colour

 

[Armoredspider]

If it came with algae it should be fine. It can be a great member of the cleanup crew. You can decide if u like it or don't.

 

[Nu-Nu the eel]

I would take it out. Just because it came with algae doesnt mean its not harmful.