Thanks! I’ll reroute this weekend, makes sense.Most people drain the emergency into the same compartment as the full siphon/gate valved drain, or to the next compartment (skimmer or refugium compartment) so that the water will still be filtered. You could just plumb the emergency into the bulkhead next to your full siphon gate valve drain in the first compartment. Draining into the return compartment just returns dirty water back to the tank and probably massive amounts of air bubbles since the emergency drain does not flow smoothly and tends to splash water.