Is the bulkhead internally threaded or external? If it's external like mine, I did a female threaded to slip, then a slip to barb to flex hose to the barb of my return, and at the schedule 40 PVC after the bulkhead I put two metal brackets, one mounted to the left inner wall of my stand and one to the rear. I had been knocking my setup around at the bulkhead going into my sump and feared doing what happened to you, and now everything is rock solid so I don't worry as much (but I still have to be cautious of course).
Not sure if any of that would apply/work with your setup, but just wanted to give the suggestion just in the event it may help? =\ Sorry that happened but hey at least the pump was off!
And that dosing pump fiasco is awful wolffman1992 . Real sorry to hear that! I am assuming there's no type of warranty option since it's fried?