It is usually a problem with deeper sand bed and usually the sand on that spot become sort of black or dark. The way to prevent this is by having sand sifting snail, like a conch or something limilar. It will go inside the sand and aerate it.
How deep is your sand? It if is only an inch or 2, I doubt that's what hapened.
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Originally Posted by reefcat
That is a very good assumption because it is almost two years old now, but how can I prevent that from happening again when I put them back in.
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