Most pods we see in our systems are benthic pod species, meaning they tend to live on the substrate, rocks, walls etc and aren't free swimming, and the larvael forms that are free swimming will tend to stay in your refugium because of the ideal enviroment there and those that do go on the trip through the return will only see a 20%-30% survival as they are pretty fragile at that stage and the turbulance of the return pump will kill off most. Thus the pods making it into your display will be minimal at best.
Best is to breed pods in a separate area and add to your tank as needed.
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