I have some of the most notoriously toxic soft corals and leathers in my tank, as well as a growing collection of SPS frags and have had no problems.
I do run Carbon and Seachem Purigen just to be safe. Soft corals typically only really release the nasty aleopathic toxins when stressed or injured, so try to avoid fragging in the tank if possible.
It is possible for Stoney corals to release toxins, but much less common than in softies.