Bean Animal drains not draining properly

[mseepman]

I have read that on startup, the reason you have 3 drains is because the system needs all three to the max and then settles in before overflowing. I plan on putting a bean-animal system into my tank..but I'm going all 1.5" (even the bulkheads into the overflow)

[WindowMaker]

good info here, I am planning to do a beananimal overflow when I move and re-setup.