How do I secure the flex hose plumbing to the bulkhead; Is there a glue I should use, or a clamp? The instructions are horrible and I asked before but can't remember where. I have the aqueon mega flow drain/ hose kit with flex hose and bulkheads and I'm starting to put it together. It's interesting that there doesn't seem to be much info on this, I've been searching eveeywherw.