Use RO/DI water, feed less and in smaller amounts. Setup a refugium for nutrient export stuffed with macro algaes.... the black algae your mentioning sounds like dinoflagelettes? (sp???) nasty stuff from what I have heard.
Those are just a couple suggestions
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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