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Do a search in the SPS forum - there's tons on this subject...
Everyone seems to like Geo for Ca Rx, and general advise is to invest in your regulator (and in some cases a peristaltic pump). I run a GHL doser Ca/Alk/mag and I like it just fine.
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Current Tank: 120G SPS dominated mixed reef, BK Mini 180, 2x250W Phoenix 14K MH/2xT5, 2 x 6105 and 1 6055, Apex, GHL Profilux standalone doser calcium/alk/mag
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