Plumbing HELP

[thanhjenn]

I'm trying to put together a closed loop for my 135 gal at base of tank. I'm using mainly pvc flex to run the plumbing as i'm not very good with plumbing. When i run the flex to the bulkhead, there seem to be a lot of stress to the bulkhead causing leaks. Where the bulk heads are, there are little space. I tried to tighten as much I could by hand. Any suggestion with tools to tighten, or should i silicone the bulkheads? Thanks for reading.

thanh