I would soak that baserock in vinegar and water and then cook it for a while(4-8 weeks), while seeding it with live rock... I couldn't believe the amount of po4 that mine leached. Of course it masked itself for the first few years with just prolonged algae stages typical of new tanks and then exploded...
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Hop
Current Tank Info: 300-gallon in-wall system (mixed reef)
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