Cichlid Dad
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Great findhttps://www.reef2reef.com/threads/noisy-overflow-please-help.796588/
here's another thread with the same brand of tank. Looks like at the bottom of the overflow there's a large bulkhead with separate connections for drain, return..etc. It could be that the connections use proprietary threading so that threaded to slip adapter won't screw in tightly even with tape or sealant.
If you bought it from the LFS have you reached back out to them about it?