Well, at this point in time my 54 has been going for 5 years and seems to be in fine shape. I make it a habit to disturb part of the sandbed each time I do a water change. I have siphoned part of my sand out and added new a couple of times. I can't exactly say how much sand, I just took a plate size section down to the bottom and replaced it. At the same time I added some extra to boost the depth of the sandbed. It's about time to do that again. I have all the same rock I started out with.
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