Live rock and sand turns brown

[Liezzzz]

Any one please help me how can I reduce the browny problem on my live sand and rock 

[quarantasei]

How old is the tank?

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[leong_rei]

Mine 4month still have sand turn brown when light turn on until now I try to put phosphate remove help abit is very headace hope someone here can help too

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[JMW]

Pictures would help, if it's just light brown top layer of sand, could be diatoms which feed off the silica in your sand. This tends to be a cycle which should pass with time supposing your tank is new.

If it's a snotty-looking brown jelly with air bubbles, it could be dinos. That is going to be tougher to eradicate.

If it's a thick brown layer over the sand, it could be cyanobacteria. Increasing the flow over the sand would mitigate formation, provided your nutrients levels are in check.

hope this helps

[Clement Chen]

Also what are u using for your salt water? That's quite important

[leong_rei]

I use renovo salt when start my new tank and until now I still using and this problem only come out when light is on my tank is 4 month old

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[kohanson]

It could be diatoms which will go away after your tank has matured. It could also be due to tap water if you are currently using.

[Clement Chen]

Agreed diatoms could be caused by using tap water. Investing in a rodi or di unit is important