Biological filtering with carbon?

[Kraken]

Hi everyone.

So I have added an LED light and Ive been running it for 8 hours a day, when the display tank is off I turn it on and vica verca.

There has been some brown algae growth but only in the sump where the live rock is.

I dont overfeed and I do a 15% water chance weekly. I dont have any other algae growth in the display tank. I also swop the filter sock every 5 days.
I can't do a water test (don't have the kit) and will only be going to a lfs this weekend.

My question is, is this growth good or bad?

 

[RiaanP]

Why run a light in the sump if there are no macro algae?

This brown algae is just using up some excess nutrients you think you do not have.

 

[Kraken]

Adding the macro algae soon
And could not keep myself from switching on the light after I installed it.

Is it a good thing that the algae is growing since it is using up those nutrients?

And Im worried that if I switch of the light the algae would die releasing more nutrients?

 

[RiaanP]

Just tun the light on a timer set to a reversed schedule than your display.

 

[Kraken]

Thank you, did it an it is set to a reversed cycle hopefully the cheato will grow