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Hi I recently got a 72gal with a 20 gal sump and converted it from a saltwater tank to a African Cichlid tank. The problem is that it is ridiculously loud and I cant even sleep at night due to the gurgling in the system

. I think that I need to install a vent in the drain hose but i'm not sure and I don't know where the best place to put it would be. 
If i partly clamp the drain hose the sound is a little better but it is still loud. If I can make it work with the hosing I have i'd prefer it over piping it all in pvc, but if that will let me solve the problem it would be well worth it.
Thanks in advance for any help and I'm open to all ideas
I've attached pictures showing the pump outlet and drain inlet as well as the hosing travelling to the sump underneath.
If i partly clamp the drain hose the sound is a little better but it is still loud. If I can make it work with the hosing I have i'd prefer it over piping it all in pvc, but if that will let me solve the problem it would be well worth it.
Thanks in advance for any help and I'm open to all ideas
I've attached pictures showing the pump outlet and drain inlet as well as the hosing travelling to the sump underneath.
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