I'm pretty sure it's up to personal preference. I made the mistake of added Zoanthids in my first nano tank while it was cycling, and still they thrived and are a huge colony now. I think it may be a good idea to wait to put in more demanding corals, but I think after cycling is done it's up to personal preference how long you wait.im not an expert but, you added corals right after cycling? I was under the impression that the tank needs to be well seasoned before adding any corals to it.