There are so many cool animals to get to add to the tank but so much potential harm that comes with it.
And still I see lots of people taking the plunge.
So would you mind sharing what made you decide to keep them anyway?

I am going to divide them into a few groups ;)

1) Critters that have the potential to die and take the whole tank down with them (sea cucumbers, certain gorgonians, etc.)

2) Critters that have the potential to cause greater than average harm to other tank mates (anemones, etc.)

3) Critters that have the potential to cause greater than average harm to the aquarist ( certain urchins, etc.)

And please to set me straight if I am wrong in any of those assumptions!