Filter socks, wouldn't catch very many copeopods compared to how many you have in the system. Your refugium will grow way more than you catch in the sock. And then how many will die when they go through the pump, back into your display. For sure not all of them, but some.
I would not worry about the sock catching too many.
It does not matter how you do nutrient export, many ways available, you just have to do some.
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