bulkhead fitting

I am trying to install 1" bulkhead on my 90gal tank for overflow. I heard that we should use silicone instead of gasket from the inside tank, gasket will be eventually leak, is that true. I want to make sure what should I use gasket or silicone before I install them because one is in and tank is...

We just tried doing a leak test on our tank, 75 gallon pre drilled from Aqueon, and had some leaking around our return pipe bulkhead. The instructions said to get the foam bulkhead seals wet and then tighten them, but don't overtighten them. Okay, fair enough. I guess our other problem is...

Had to drill into sump. After hours of plumbing, had skimmer up and running. But noticed a small drip coming from bulkhead fitting!....So in a panic, not wanting to drain sump and disconnect all the plumbing. I turned to JB weld underwater. WHAT A JOKE....ended up having to cut old fitting off...