Yes, Squamosas can be kept under PC lighting.  I have both Derasa & Squamosa under 96w PC & 2 T-5 20000ks & they're both growing & getting more colourful.  I keep them on top of my LR attached to flat oyster shells & cushioned by some moss-like macroalgae.  Their 3" from the lights. With only a 12" deep tank, even on the bottom, you would have enough lighting for low light requiring Squamosas.  I feed mine rotifers & Tahitian blend nightly (from OA). 
 
Anthony 
		
	
		
		
		
		
		
	
		
		
	
	
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