Scott I used the 250W penant over my 24g gallon for a while and was happy enough with it but missed the supplimental lighting so I went back to my 175W/VHO fixture.   
I do use the Geisemann 250W/T5 fixture over my 44g cube and could not be happier.  The Geisemann true actinic are very blue so it is a nice combination with the megachrome bulb. 
		
	
		
		
		
		
		
	
		
		
	
	
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