Just a footnote to add with valuable information: The director of Husbandry at the North Carolina Aquarium, in Emerald Isle returned my call regarding my issues with the through hull fitting (ie bulkhead fitting for land-lovers). Here's his answers:
1. First and foremost, bronze has copper alloy in it (copper & tin). So, it cannot be used.
2. Second, my brass hose bib has copper in it (copper & zinc). So, it cannot be used.
3. I was told the safest sealant to use, is 100% silicone. Like the kind you would use for an aquarium.
Guess you can tell I'm a newbie. I'll remove the media from my bio-filter tank. Catch the 3 fish and place them in it. Shut down the pump, drain the 300 gallon horse trough. Thoroughly dry it, and install a nylon or plastic bulk head/through-hull fitting (after coating the flanges and threads with silicone) and tightened it. Then, using a hair dryer on low heat, I'll speed up the curing process of the silicone. Re-fill with water and check for leaks. Hope I can accomplish all this before my 3 fish get stressed from being couped up in the 100 gal tank. At any rate, copper is a BIG NO-NO!!!
