brown on rocks and coral

[clownbob]

I gave it a little brush on one rock and it comes clean. I'll do small amounts at a time. There are no big pieces after I brush - it kind of just goes into very tiny pieces that can't really be siphoned off. They do go to the filter so most of it should go there or settle on the gravel which can be filtered later.

[elitesurfer]

If you don't have a nitrate NO3- (not Nitrite NO2-) test kit, I'd recommend to get one so you can test wat your levels are at.

[clownbob]

What's the difference between NO2 and NO3?

Going out for a couple hours - will check form when I get back.

Thanks for the help. I just hope I don't get addicted to this.