Having owned many types of clams, and keeping them all under 400w, I can't really argue with any first hand experience, although hobby lore has reported my statement to be true in many articles. I've also known people that could keep derasas or squamosas under lights that would cause the croceas to fade away.
Not scientific, and yes, the last maximas I swam with were 30ft+ below the surface, but generally people report maximas and croceas as requiring more light..
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Brad
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