Sand turned hard

[Reefergirl82]

Hello,

 

My sandbed has turned rock hard except in the back where there isn't as much flow or light.

I don't know what to do to prevent this as I don't know what causes it. Coralline has started to grow on it since it has turned into a rock.

 

Any advice on how to prevent it and on how to replace it with sand again is greatly appreciated.

 

Thank you.

[seabass]

Do you dose Kalk?

[Cencalfishguy56]

Hello,

 

My sandbed has turned rock hard except in the back where there isn't as much flow or light.

I don't know what to do to prevent this as I don't know what causes it. Coralline has started to grow on it since it has turned into a rock.

 

Any advice on how to prevent it and on how to replace it with sand again is greatly appreciated.

 

Thank you.

lol this happened in my last tank, what kind of sand are you using?

[CaptJab]

Seems like there are 2 ways for this to occur. one way is chemical and the other is biological. There are ways to test it, but I can't remember how. Seems like bleach is involved on the biological one. Just remove a piece and drop it in bleach, if it falls apart, it's bacterial, if it remains hard, it's chemical.

it's been a while so I could easily be wrong, but maybe you can find something from that small amount of info.

I do remember it's more common for it to be chemical related.

[Clown79]

Doesn't this have something to do with precipitation? I could have swarn I read that somewhere.