why is my sand browning?

Jamess

Member
Joined
15 Sep 2008
Messages
48
hey i have argos playsand capping tetra plant complete in my rio 180, the sand is in 2 places of high flow going light brown and and sticking together. the sand everywhere else is fine. Is this diatoms?
 

Jamess

Member
Joined
15 Sep 2008
Messages
48
this has been setup since the start of december. Its an upgrade from my old smaller tank
 

Jamess

Member
Joined
15 Sep 2008
Messages
48
cheers mate, how long does it take to go? everytime i siphon the top layer of and add new it comes back.
 

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