Very mature rock

[whatcaneyedo]

The average age of my rock is about 10 years so I think you've got a ways to go. About once a year or so I try to pick up a new piece and sell an old one to reintroduce some biodiversity or clean things up a bit if a rock is thoroughly covered in coral. I don't believe that rock goes bad either but I do wonder about what is going on at the microscopic scale in a closed system as the years go by. My worry is that our tanks lose biodiversity as certain organisms and bacteria dominate.