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As far as lighting it`s not WPG that really matters any more. With today`s technology it`s about intensity or PAR. We still use wpg but only as a vague or broad application.
Up to know I don't have Any algae problems and the tank is been running for almost 3 months now...this week, after installing the led lights, some dark purple-blackish spots have appeared all over the sand...also,last week a pair of red spots appeared on the glass and I cleaned them with the magnet but one of them appeared again...