Do Anybody know a good Calcium Reactor with quieter pump, because I have the Octopus and Korallin Calcium Reactor (Eheim Pump). They both sound like a lawn mower especially the Octopus pump.
Eheims are typically pretty quiet, perhaps yours has a broken shaft which makes them noisy. Take it apart very carefully (to not break an good one) and take a look.
Not much to do about the octopus other than switch to a sicce pump or other high end one