At the beginning of the year I bought 2 common plecs.  Since then I've been feeding them like nuts, but they won't grow past 4~5".  They have coloration that looks like it came from a dinosaur.  And it changes color depending on lighting.  This is almost exactly what it looks like.  I have 2 in a 55G and they don't mind each other in the least.  They've been this long for several months now while my oscars get huge.  What could they be?  
		
		
	
	
		 
	
				
			 
	 
	             
 
		

 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		