New aquarium overflows

Spydersweb

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Hello all,
So I finally bought what will be my 1st SW aquarium. It’s a 90 gallon with a single corner overflow. The default plumbing it comes with is two holes for bulkheads; A Durso, then a return from the second bulkhead. My question is; would it be better to plumb the single Durso and the return from the second bulkhead, or would it be better to use both bulkheads for a Herbie, and plumb the return around d the back? Is the flow rate the same for the herbie and durso? Is the benefit if a herbie just the backup emergent drain, or is there more to it? Thanks in advance!
 

Do you have any coral frag mounting tricks or tips you have learned that really help you?

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