I attached some photos to try to make my question more clear. Are both of these pipes and holes just for draining? There are no other holes drilled in the tank so was the previous owner most likely doing a HOB return line?
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Will do. How far from the top of the overflow would you recommend for the drain pipe?I’d raise the drain pipe too. It would be noisy with the water falling that far
Thank you, appreciate the help!You want the top of the hook like an inch under the overflow wall. I’ll take a picture as soon as I get my daughter to sleep…. She battling me tonight

It’s 24x24x29. Weird dimensionsHow big is the tank?
Perfect, I will snag some new pipes. I guess I could try one of those pvc extender attachments but not sure if that’s worth itRed is drain and yellow is return
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Couplings would work greatPerfect, I will snag some new pipes. I guess I could try one of those pvc extender attachments but not sure if that’s worth it
I’ll go for that! This is my first sump system so I’m going in blind lol. Have large freshwater tanks but I just run multiple canistersCouplings would work great