If you can find a union that is small enough to fit through the nut for the bulkhead, sure. If not, I wouldn't. You won't be able to remove the bulkhead from the tank without sawing it off.
Teflon tape works pretty well, that's how I did mine.
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90 Gallon Mixed Reef with 20g sump
Current Stock: 1 - Ocellaris Clownfish, 1 - Yellow Tang, 1 - Kole Yellow Eye Tang, 1 - unidentified hitchhiker goby, 1 - Coral Beauty, 3 - Lyretail Anthias.
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