Wendell that is a tough question because I think a lot depends on what one interprets as success and what you kind of reef you keep, some require more science than others. That said I do at least sort of agree with the 60/40 ratio. It starts with science and testing but over time you get a feel for it and can often tell when some elements need topping up just by looking. So yeah I think it starts with science and slowly becomes an art.
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Greg
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