I need Help
			 
			 
			
		
		
		
		Hi everyone, I could for sure use some help.I have a biocube 14 that has been up and running for over a year now, its a berlin setup with sps and two percs. The Sand bed is about 3 inches deep, with 25lbs of live rock. I have a lfs back pack skimmer and radon lighting. 
Parameters a re as follows: 
 
SG35 ppt 
Temp 73F 
Cal 500 ppm 
Mg 1500 ppm 
Alk 10.2 dKH 
Nitrites 0 
Nitrates >60ppm 
Ammonia 0 ppm 
Po4 0.03 ppm 
 
I have been battiling very high nitrates for about a month now, I have done every other day water changes, I have been using red sea NoPOX, to no avail. I have looked for dead debris and not standing water, there is very good flow. I am at a lost with this. I have been thinking if this could cause my problem: 
 
I have a pistol shrimp and he is moving sand everywhere every night. Keeps digging and making tunnels, and with a small footprint can this cause the high nitrates? Needless to say my sps are not very happy and neither am I. Any suggestions would be appreciated. 
		
	
		
		
		
		
		
	
		
		
	
	
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