Personal opinion is bubble tips. They host I think 11 of the 13 species naturally and usually do good in tank. They do like to move until they settle on their spot, so make sure to clear space for it. Also, they like high lighting and flow, but I have seen them live fine in PC's with low flow. Not recommended , though. Mine has split twice and my clown just loves them. There are a lot of choices out there, so do some research. Mainly try to stay away from most altalntic species. gigantea, magnificents, ritteri, haddoni, bubble tips, seabae, lta's are usually good choices, some hardier and some rarer than others. There are a lot of articles on compatability, so look into it a little bit before you buy. Learn first, thrive later. Buy first, die later. Not only to you, but for everyone reading this: YOU HAVE TO READ UP ON A PRODUCT BEFORE YOU PURCHASE IT!!!! If you don't, there is a good chance you will regret it in the future.