With inverts I would think after your tank cycles would be good. They are usually sensitive to any water chemistry changes in short times especially in nitrates and salinity. What I did was find the cheapest shrimp I could and threw him in there bc I would rather a peperiment or camel back shrimp die before cleaner or fire red shrimp. Coral it really depends what type many times if you get on live aquaria it will say recommendations of the established aquarium. Id say after cycled 2 months softies 5 months most everything else 8 months nems. Make sure you have the lighting requirments bc that is just as important as having an established tank for the coral.