[steve the plumb]

Use good glue.(weldon ).Don't use the kitchen&bath silicone.I would use silicone on the threads for the dart pumps and anything else that has threads.I used Oatley thread seal or thread lubricant.You find it at HD.Its liquid Teflon( its grey)I don't know if its reef safe.I used very little of it and its only on two threaded joints where I had a leak so I used it.I tried my best to only keep it on the threads.I don't know if anyone here knows if its reef safe,but like I said I used very little of it.