Quote Originally Posted by pilot_bell777
OK...so if you don't have a HUGE sump then run carbon on the output of the skimmer?
Yea, that's what they (the mfg) suggest. Ozone is a strong oxidant (like chlorine) and residual ozone making it back into the tank can really harm your fish & corals.

I do run charcoal in my sump, but the return from the skimmer doesn't run directly through the charcoal.