This is a really good point. And it may have been what happened to my last tank at the 5 year mark. Things went bad. And quickly. I have to admit, I was in Coast Mode, as everything was going great. For years. I took things for granted and my livestock paid the price.That whole “coast with minimal effort” thing leads me to believe it’s not just an age thing. I’m not saying you neglected your tank but, imo coasting is when stuff starts to die because you’re thinking it looks good and fine and you start to slack on maintenance. Not maintaining the tank the with same effort you once did can bring on a slow boil of change for the worse. The microbiome is living and always changing, IMO the microbiome also changes because of our maintenance schedules. By not maintaining it the same way on schedule the microbiome will try and cover for us Until it changes too much and bad stuff starts to take over.