20 gallon tank overflow for sump

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Hey I'm try to plumb a sump into a 20 gallon nano reef im trying to set up. Was curious on the easiest/most cost effective way to do this. Thanks for the help!

I am able to drill holes and want to drill for a return as well. This is for a friend and we are on a buget.

 

[Blue Ring Octopus]

Eclipse S Overflow, I would get one of those. I am sorry I have given up on trying to copy and paste links.

 

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Looking into an Eclipse S Overflow! Im thinking just cut a hole and add a dursio drain right into the tank! Would there be any problems with that?

 

[Blue Ring Octopus]

Then will you build an acrylic box around it? I would go with the OVerflow box in the back unless you want to do it on a budget.

 

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Then will you build an acrylic box around it? I would go with the OVerflow box in the back unless you want to do it on a budget.

Realistically what would an overflow box do??