Seems i'm messing up today. I didnt check date of thread or even last post. Before this replied to another thread which is about year old.
Will look into the oct 800s mode. Thanks.
One of my friends mixed blacksand with whitesand. It looks good, but the black sand does not buffer at all. You should only mix it in the top inch or so
Tangs arent suited for your tank size. My suggestions:
http://www.liveaquaria.com/product/prod_display.cfm?c=15+28+108&pcatid=108
or
http://www.liveaquaria.com/product/prod_display.cfm?c=15+30+146&pcatid=146