bulkhead question

[CKreef]

I finished plumbing my tank tonight and i have one question. When the water drains into my overflow the bulkhead is still above the waterline. Is there anything i can do to stop the bulkhead from drawing in air? I thought about putting a 90 degree elbow in there. Will this work or cause my water level in the overflow to drop to this level? Will the water maintain a level above the fitting? Thanks

 

[coral_reefer_25]

Put an elbow in there, but drill a small hole...like 1/8" in the top of the elbow to allow for a little air to enter. Otherwise, you'll get a toilet flushing effect.

In essence, it'll be just like the durso standpipe.

 

[CKreef]

will this stop the air bubbles going into my sump?

 

[fishdoc11]

No, you will get some bubbles. You need to allow a ceartain amount of air through or you will get a flushing action like Ryan said.....thus the air hole.
Chris