Thanks guys.
Meanwhile I'm not happy with the colours of my SPS, I think the lack of a fish population and dissolved organic matter plays an important role here. Yesterday I start adding a little fish food into the system (brine shrimp, cyclop-eeze mixed with Vitamin C and Essential elements from Kent Marine).
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"The natural world is, and probably always will be, complicated far beyond human understanding." J.E.N. Veron
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