Leak at PVC Connector

[ImperialWookie]

So I just upgraded to an 80 gallon shallow reef with a sump. My first tank with a sump as opposed to an AIO system. The tank is used. I connected the plumbing and got filled up the tank, started the return pump and noticed a slow drip leak. Not sure what to do in order to stop this. The leak is at the PVC connector as pictured below. Any help would be great as this is my first ever not AIO system!

 

[ForTheLoveOfCoral21]

Glue it, if you glue it, it will be fixed!

 

[WestMI-Reefer]

Make sure the union doesn’t have a crack.

 

[BaliReefBox]

if that is your return line run rigid to the pump then couple it with flex line, 6"-12"

 

[DonTavo27]

Close up pictures of the leak would help.

 

[ImperialWookie]

Got it fixed! The o ring within had been dislodged. Replaced it and now we’re good!