Good day! I have a 5'x3'x1.5' predator tank (6 7"-groupers) with an Eheim canister and a Jebo venturi skimmer. Is the gas exchange from the skimmer's vortex chamber enough for the fish's O2 needs, or do I have to elevate the Eheim's return pipe above water level for additional surface agitation/gas exchange? I'm worried about stress from too much water turbulence, and of course, salt creep.
