Its my understanding that pretty much anything that travels through the UV sterilizer will be nuked.
Yellowtang, you are likely seeing the pods that were alreday in your DT.
I started off with only base rock in my tank, but come to think of it my return pump does have a T that Brings water back into the DT through both overflows and since my UV is only on the right side return anything going through the left would be safe.
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