I just think the more you pack in there you need to research extensively. Some corals will sting or kill others when fighting for property. They are like fish in some respects. Many will co exist peacefully, others wont, so placement is important. Water changes are very important and the use of a good reef salt mix. The more corals you have, the more they deplete the essential elements in the water, making water changes very important. They need the elements in the salt mix to build themselves.