After 3 years of build up and an algae bloom followed by use of the Vibrant product my tank crashed hard and wiped out pretty much everything. I stripped the whole thing down and cleaned all of it and set back up. All new sand DSB this time 6". Just ordered a feeding station to help make sure food doesn't end up in corners and rotting. Also greatly reduced the amount of rock to try and make it easier to clean. I lost all my fish and probably won't add any for a while. Trying to save my various zoas and my Duncan. If looks like about half the Duncan died, hoping the rest recovers.