Nice work , Looks like it going to be a sweet 40 breeder
What size is the drain , If you have a 1" drain , then no more then 600gph . if you are going with a refuge , then a slower flow is better for more contact with the marco and skimmer .
If you are using a bulkhead , then a slip elbow is no prob, just make sure you can take off the bulkhead if you have too
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