korallin, geo, mrc, which should i buy?

eddie c

New member
in the market for a calcium reactor and was looking into the korallins due to not having to use a feed pump and no ph controller needed, but are these easy to use or due they require alot of fiddling with?, was also hearing good things about geos, and mrc any first hand info on any of these units?
this will be going on a 75g mixed reef.
 
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