Nudibranch good or bad?

[Fish]

I pulled up a photo of a lettuce nudi and what I have in my tank has a similar kinda bland color but it does not have "frills" on its back like a lettuce. It looks more like "tassles" like the top (tentacles/gills/??) of a sea apple.
Sorry, I'm still trying to get a photo but I turned my lights off to acclimate the zoos and the halide isn't coming back on. May have to wait till tomorrow.

- Chad