You don't want to tie drain lines together. It cuts your capacity to drain in half.
In your case, I would use each overflow box as a separate Herbie drain. Then run the return for the sump over the back of the tank.
So each overflow will contain one syphon and one emergency drain.
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Pat
Current Tank Info: 125 in-wall , 40b sump. 6 bulb T5. ASM G2 skimmer. LPS and leathers
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