I've never used the Korallin reactor but do have a Precision Marine 622 set up and running on my 230 that I am very happy with. Basically plug and play which suits me fine. I am setting up a grotech reactor on my new tank which is a PITA to set up but what I do like about it is that is has a degassing chamber to prevent any stray CO2 from getting in the tank. Still waiting on a couple of things for it so can't report on performance.
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