Orange nudibranch ?? good or bad

[chriscsada]

Hey everyone, recently I have been losing some coral slowly, my parameters have been stable so I was thinking it may be my lightbulbs as I run t5 54 w bulbs and they haven't been changed in a bit but otherwise I have had slow growth and noticing some corals not looking to healthy so I will see if this may be the issue . I have also recently notice a few of these orange creatures in my tank and I was wondering if they may be the cause or if anyone knows what they are and if they are good or bad ? I hope the pictures work.

 

[griss]

I’ve seen pics of these before and cannot for the life of me remember what they are.

 

[chriscsada]

Do you recall if they are good or bad ?

 

[kharmaguru]

It's not a nudi, it's a sea slug. Probably eats algae so not harmful.

 

[C.Eymann]

There are a few commonly encountered slugs from the Elysia genus that are much smaller than other familiar species in the genus sold as lettuce sea slugs for algae control like elysia crispata. The smaller ones I usually see are more of a yellow than orange.

Another somewhat common small slug found in tanks that are bright orange is vayssierea sea slugs, they exclusively feed on spirorbid worms, in which I usually find them and the little red eggs they lay underneath frag plates among clusters of spirorbid worm shells

Maybe look up these these two genus and start doing some comparisons, I wouldn't worry about it as it's a sea slug and not a nudibranch and most seaslugs aren't corallivores like many nudibranches are.

 

[chriscsada]

Thanks for all your replies.