Final countdown - how much tension in plumbing do you have?

Prepping to water test my tank, and everything seemed aligned well during the gluing stage. Now I feel like I have to have some tension to run my plumbing pipes. I have rigid to flex pvc, and the flex wants to tilt my rigid pipes I also have to pull up on it 1/8" to align the union right.

Am I aiming for a nightmare does the pipes and overflows / tank handle a little flex?