Building a new sump!

[armyman16]

Many of you helped me with converting my sump into a refugium but now my friend is setting up a reef tank!
He's not sure in either a 75 or a 55 but he wants to use a canister filter, I personally don't like those, because they are so high maintenance!
So I talking him into building a sump but I'm not exactly sure how?
What do you all use to keep the dividers in place? Probably going to just buy a standard 10 or 20 gallon tank depending on what size he buys
But my first question is, how to keep the dividers in place? Is it a type of glue? If so, what kind is safe for fish?

 

[spoonman]

I used aquarium silicone bought at my local fish store.

 

[armyman16]

I used aquarium silicone bought at my local fish store.

How much did that cost you?

 

[Rutrag]

You ought to be able to get a tube for a caulk gun for around $10. There are also tubes about twice the size of a toothpaste tube for $6-$8.

 

[armyman16]

You ought to be able to get a tube for a caulk gun for around $10. There are also tubes about twice the size of a toothpaste tube for $6-$8.

That's pretty good, an I have plenty of caulk guns!! How could I get the water from the overflow into the sump? I've seen a lot of different ways but what do you all think is best?

 

[Sniperhank]

Flextubing is the easiest, though I like PVC myself. It isn't as hard as some people make it out to be.