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Hey! I know this post is a little old but, thought I would give my input. So, I have been keeping cresties since 2006 ish, I had groups with light and without lights and I never really seen a difference. I don't really keep lights on them anymore unless they are in a bioactive but its more for the plants, its just been my experience that they just hide from the lights. But, others recommended it with the mindset of, "it doesn't hurt all it can do is help" which I agree, but if there is zero difference then I'm not going to waste the electric or natural resources lol. The only things I did notice is that it sometimes "grays them out" instead of showing their natural color, but a few hours of the light off brings back their natural color
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