From my understanding they won't leach. I'm putting my trust in Levi.  
 
The other reason I went woth the tile is I'm sure sps will encrust on them. Giving me a little more room for frags.  
Also I like the cleanliness of barebottom but not the look so I hope this is the best of both worlds 
 
The directional bulk heads are to be pointed down to blow directly on the bottom keeping organics suspended. 
		
	
		
		
		
		
		
	
		
		
	
	
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