Post from Dec 20, 2017: I'm totally bummed out tonight. I got a call from my wife this afternoon that there was water on the floor next to the tank. Like a pro, she powered everything off and soaked up the water before it could do any damage. When I got home I turned the return pump back on fearing that my new manifold was to blame. Turns out that I was half right. The leak was a slow drip coming from Red Sea barbed adapter on the return line. I replaced the stock barb with a 1-in to 3/4-in threaded barb. I've read others have had good luck using 3/4-in NPT adapters with a ton of PTE tape. I opted to use RectorSeal 5 and made sure not to over tighten. It held for 3 days without a drip. Then today, it developed a hairline crack almost dead center in the middle of the fitting. I'm sure this is my fault for trying to use NPT and BSP together. I'm guessing I'll need to order a new adapter from Red Sea and try to find the correct BSP barbed fitting to get this to work.