[Delphinus]

You know what, I'd consider bamboo sharks on your yellow list instead of your red list. The main problem with them is size, but otherwise, they more or less just sit there on the bottom and don't really have a lot of requirements. The main problem here is that most people will not have an appropriate sized habitat for them. But if you had the space to build, say, a lagoonal habitat that was really long, really wide and shallow, I don't see why they couldn't do fine long-term in there.

Also I disagree about gorgonians. Or at least you have to specify that you mean the non-photosynthetic species as being questionable. There are several species of photosynthetic gorgonians that are incredibly hardy in aquaria. Do agree that the nonphotosynthetic gorgonians belong on the yellow list over the red list because it is not impossible to keep them, but it is rather challenging and rather specific requirements that will be beyond the interest of the average aquarist.