I feel you on that. I have one large tank that’s doing well, but I attempted to start an SPS based nano cube last summer. Let’s just say I gave the tank to a friend because I gave up after 2 restarts with it. If you decide to get new rock go with TBS live rock or Gulf Live Rock. Great rock and an excellent way to seed tank with goodness.Rebuilding the tank from scratch. All corals are dead and the rock are covered in algae. As I've said before I hate this hobby and love this hobby. I'm going to tear it all down and try again.