Any of the soft corals, but beware that they can spread like the plague. I find that to be especially true of zoanthids, palythoas, and the tree-like softies like the aptly named Kenya Tree.
I also have over 40 corals in a mixed reef and do not dose at all. If you are willing to keep up with water changes (and you don't have a ton of SPS corals), you can get away without dosing. I change roughly 15% weekly.
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