Brown algae in empty tank ???

[nutto]

Hi I 'm setting up 75gallon reef tank with 2x250 w metal halide and 2x55w pc. I running empty tank with salt water for 2 weeks .Suddenly brown algae everywhere. Anybody have any idea what is cause this problem or anyone exp this before ? little help 'll be nice. I used ro water in my tank . :confused: pls help...

[Blown 346]

You are experiencing brown diatoms which is normal, the lighting isnt helping either. During a cycle I would reccomend little no lighting at all. The less light you have the less algae you will have.

[nutto]

my tank is empty . I mean nothing in there .just salt water no rock nothing..

[Fred_J]

It will still grow algae if it has water and light.

[PatMayo]

The algae has nothing to do with rock or fish. As the previous posters said, water and light is the combination needed.

Regards,

Pat