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The maker doses this by schedule rather than by a fixed potency, so the calculator cannot use it. Follow the directions below.
Iron + manganese source aimed mainly at macroalgae/refugiums, seagrass and zooxanthellae; dose per label and by test.
• Overdosing iron can fuel nuisance algae
Missing: Fe/Mn concentration and label dose (not on the TLF site).
twolittlefishies.com/products/iron-concentrate-500-ml-16-8-fl-oz