Sadly, that nudibranch is exactly what was stated above. It will only eat sponge, so it will most likely starve to death. If your husband paid for them, try to take them back. If it came in on the gorgorian, I would still try to take them back. Maybe your
LFS would give you store credit for them.
As for the gorgonians, it is a yellow finger. It is a non-photosynthetic coral that will require daily feedings of something like marine snow. It should be low in the tank with medium flow. I'll link the DFS page to it, theirs shows more orange than yellow for some reason but it is still the same coral. Good luck, this is a very challenging coral that you might want to consider trading in for something else.
Saltwater Aquarium Corals for Marine Reef Aquariums: Yellow Finger Gorgonian