You definitely do not want to add all of those at the same time!
We cannot answer the question if it is too much for your tank though because it all depends on the tank and the equipment you have hooked up to it. List what type of filter you have, protein skimmer, etc. and then we can answer that question.
In my 75, I have a spotted grouper, saddleback hogfish, 2 small puffers, and a volitan lionfish and my tank is about 7 months old. However, my tank can handle this huge waste load because I have a good wet/dry filter, Super Reef Devil Protein Skimmer, 60 lbs. of live rock, and I do weekly water changes. This keeps any ammonia and nitrites out of my tank, and helpes to keep the nitrates down to a stable 20ppm.
You have to let us know your tank specs before we can answer this question correctly.