Plumbing tension advice - rigid / flex - when’s it a problem?

[NancyFish]

Flex pipes are wanting to tilt my straight pipes — is any tension a problem?

I have to lift less than 1/8 1/4” to screw my unions together (straightening the flex out a little) I don’t recall that much gap when i first glued them last week - but here we are. I can screw everything together but I’m wanting your guys opinion on alignment and long term issues?

You can see my finger is where the blue pipe was then the flex wants to curve it out a little. I keep playing with the tank and sump position to see if I can get it right but I keep wondering how much tension and how it can spread from the pipe upto my overflow and onto the glass of the tank?

 

[NancyFish]

The pipes easily (whether connected to the bottom fitted or not, can pull a little to the sides. But you can see the fittings I can screw them down but in their natural state still want to lift

It seemed good while glueing but maybe I wasn’t as loose holding onto the flex pipe.