My first time setting up a doser, I went with a Red Sea 2 head doser and Voss DIY containers, theres a bulkhead in the lid with hard acrylic tubing and an adapter that i had to superglue on to attach the doser tubing. Problem is its all setup but the pump will not draw the liquid out of the voss container, it just primes endlessly. How do i get the suction to start?