After filling the tank for approx. 3 days in a row, I have noticed a bit of an issue with the return plumbing. As of right now, whenever I turn on the return pump, there is a noticeable leak between the return plumbing and the flat bottom side of the tank (shown in the image). I have been trying to tighten the pipe with a wrench to ensure that it is sealed enough, but I am fearful of cracking the pvc and/or ruining the bottom covering of the tank. I am really surprised that there are no clear instructions for this, as I really wanted to know if there was an o-ring meant for this fitting. I tried to contact CADE support but the call dropped after being left on hold for a while. Does anyone have any recommendations?