[Sk8r]

Best to have started with new sand, but what is now is. Do you have as many pounds of live rock in there as you do gallons? Could it run safely without your filter at all, ie, do you have really big fish, or can they get by on no-filter? If you could get a fuge started, with no filter at all, you could get on top of the problem in a few weeks of cheato lit 24/7. I think it's quite right you've got a minicycle going, and that filter imho is going to make it a little harder to get stabilized, but some water changes will help---an urchin might help, at least to get the phosphate [which you have in great abundance] into the water column where Phosban or a fuge can suck it out.