Ingnorance def; Lacking knowledge, information, or awareness about something in particular. I was aware of what it was and its bennificail nature, meaning I am not ignorant in the topic, hence the right to call you ignorant because at the very least you didn't know what it was. I don't expect you to like me, or my opinion, but you would be wise to listen to those who are more knowledgable about the hobby then you are.
Second of all I never said leave it in with your corals, I said put in a QT or Sump or heck even a breeders box, your corals would be safe wile finding info about it, and you could have kept it or given it to someone else as cleanup crew, or even killed it anyways once you knew what it was.
Thirdly I'm not an "animal lover" everything has its place in the world (in this case, eating algea, aka clean tank), I eat meat etc, my point is, there is no reason to kill things because they are unknown to you, or because you don't like how it looks, if you KNEW it was a raging coral predator I wouldn't have commented about it, as I probably would have done the same thing, but you didn't you just made an assumption and killed it. This "ugly slug" which isn't really correct, as its something between a slug and a snale as it has either a full shell or part of one, would have been an excellent addition to your cleanup crew, or could have made an addition to someone elses. You could have stuck it in a jar and brought it back to the FLS and they could have sold it.
If commenting again gets me banned, fine, life goes on, its people like you that don't desearve to care for the beautiful life that makes up corals, as you automatically dismiss everything that doesn't fit into your definition of perfect. When you've done as much research, had as much experience, and read as many articles as I have on reefing, and I'm talking all aspects, I will listen to what you have to say, but untill that point, I hope your backwards veiw on reefing doesn't influence others.