Building a 1500 Gallon plywood & glass tank

  • We are currently upgrading MFK. thanks! -neo
if you cant fix it, caulk it :D, i always make sure i do a quality caulk on bulkheads after they are in, figure, worst comes to worst i can always cut it away
 
Use silicone grease between the gasket and the bulkhead, on the tank wall, and on the bulkhead threads. Tightness isn't what seals it. If you tighten it too much, you'll torque the gasket and it'll leak more. The silicone grease allows it to slide on the gasket while tightening, so that doesn't happen. The bulkhead should be firmly seated on the gasket, but not enough to indent it.
 
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ADVANTAGES
Silicone Greases are used as a clean lubricant substitute in places where petroleum oils are inadequate or not desirable. Waterproof and chemical resistant. Stable consistency over a wide temperature range with extremely low volatility. Non toxic, non staining material having exceptional physical and thermal stability.

USAGE
The lubricant of choice for food equipment, water fixtures and in high or low temperature appliances. Silicones are compatible with most plastics, rubber, leather, composite fibers and metal. Its' high dielectric strength insulates and allows for the safe lubrication of electromechanical devices.
High viscosity makes this grease an excellent choice for sealing gaskets, o-rings, ground glass fittings and in vacuum applications.

That should explain away your concerns. And besides that, the fish never come in contact with it if applied properly.
 
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