This is a question that has always plagued me, I have had mult. blue rings and have kept them under black lights and they have done fine... Im looking into keeping a bimac shorty and want to get the lighting perfect. I know 10,000k is the way to go, but I want a more blue spectrum in the aquaium(for personal pleasure). Can I 50/50? 10k and atintic? Full atintic? Black light? Has anybody had any luck with any of these combos?