Yellow Slug

[MR2MAS]

Can any ID this guy for me? I first noticed him the other day on my front glass so I couldn’t get a good shot of him. He finally showed up again on my leather. I pulled him out just in case but wanted to see if anyone can recognize what it is.

 

[Mr_Knightley]

Can any ID this guy for me? I first noticed him the other day on my front glass so I couldn’t get a good shot of him. He finally showed up again on my leather. I pulled him out just in case but wanted to see if anyone can recognize what it is.

if it's on the leather, it most likely eats the leather. That's typically how it goes with Nudibranchs, which this clearly is. Sadly you'll have to flush it, don't feed it to your fish or anything as it might have accumulated coral toxins inside of it.