lettuce sea slug

im a huge fan of gastropods, and i would love to have one of these amazing creatures in my living room, and i know that they are somewhat photosynthetic, stealing genes from algae, but are the blue ones AS photosynthetic? the blue ones are absolutely gorgeous, but all the other gene-stealing...

Has anyone had issues with zoanthids or Ricordea mushroom coral harming the lettuce sea slug ? Ours is only about half inch maybe 3/4” when roaming around. Worried about the size of the lettuce sea slug and the size of the mushroom or zoanthids possibly eating or shocking it.

ok so i just ordered a lettuce nudibranch or lettuce sea slug i know they suck the chlorophyll out of bryopsis which is why i got it because i have bryopsis and i thought he could be a really big help but my question is will it become more green with the more algae it eats it looks like this...

Is this a lettuce nudi? Got it for free with some snails. Guess they accidently threw it in.

This is my tank for my 2 dwarf seahorses that I will be getting later this week! I am super excited to get them, along with 1 lettuce sea slug! :D