As pointed out by drillsar, your phosphates are extremely high at 10 ppm, as the GFO media is rather expensive and to lower that level you will need to replace it almost every week, instead of GFO to use Activated Alumina (Seachem's Phosgard), just rinse it well in RO/DI before usign it as it relases some aluminum that may afect some soft corals but at this point you shall have no issues.
BTW activated alumina is an excellent adsorber of Silicates, removing them will help control Diatoms as a side benefit although I would not be concerned about diatoms but about hair algae that will pop up if you can't get nitrates and phosphates under control.
Once the phosphates are under control and below 0.05 ppm you can switch to GFO (PhosR, Phosban, Rowaphos etc.)
I will suggest making water changes even during the cycle and blow off detritus from the rock by using a powerhead.
The idea is to not only develop bacteria but also end up the cycle with clean rock.
If you are not yet, I will suggest running your skimmer.
Keep in mind that phosphates can attach to the rck and sand and the longer the rock is exposed to it the more difficult will be to control them in the future.
