mh question

I've seen it done before but you'll definitely see the difference...and in my opinion it looks weird, but I guess it's up to your own taste.
 
correct me if im wrong but i assume you like the color of the 20k but want the growth out of the 10k? if so just put all 10k bulbs over your tank and supplement with 4 Pure Actinic T5 bulbs to get the crisp blue look.
 
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