Any update? I am having a similar issue with my new tank. From reading this thread I assumed that the water is trickling in around the interior overflow box connection to the exterior box. Not that your bulkheads were leaking.
I bought a Fiji cube overflow and I get a small trickle from the connection point. I am worried as my sump cannot handle draining the tank to the low point of bulkheads. Sorry to hijack
I bought a Fiji cube overflow and I get a small trickle from the connection point. I am worried as my sump cannot handle draining the tank to the low point of bulkheads. Sorry to hijack