120 Gallon Progress

[vanreefer]

Originally Posted by NanoReef

the drains are plumbed INDEVIDUALY with 1" pipe. the overflows are 6x6x22.... i still dont understand. i NEED the flow cranked up but if i do, it drains that side of the sump in like 3 seconds...

I think this means there are two pipes all the way to the sump... I think only pics can help now

The height of the standpipe shouldn't matter unless its higher than the tank
I remember you said the tank overflows when you turn on the pump if this is the case then you have a problem with the overflow/ bulkheads... when you turn the pump off after an overflow, does the water level in the tank drop? quickly? slowly? not at all?
this is puzzling!