Dougs 90g SPS Reef.

[Doug]

So the overflow stuff is half inch acrylic. We using weld on for the acrylic to acrylic joint and silicone for acrylic to glass.

[Myka]

Originally Posted by Doug

Hmmm. So no way to attach it. An acrylic cement. ? How do they attach acrylic overflows ?

Originally Posted by Doug

So the overflow stuff is half inch acrylic. We using weld on for the acrylic to acrylic joint and silicone for acrylic to glass.

That's how. Personally, I'd rather use a glass overflow and silicone 1/4" acrylic onto it. I wouldn't trust the acrylic to glass seal long-term. Make sure you have standpipes in the overflows in case they leak so they don't drain your whole tank. If you want to have a sweet overflow, use black glass. Acrylic attracts coralline algae like nobody's business and you can't scrub it off because you will scratch the acrylic. That's the reason I got the whole back of my new tank done in black glass.

[Doug]

Tanks for the great info Mindy. The black glass only comes in 6m so going with acrylic covered glass in 3/8th plus the acrylic. And yes I have stand pipes. I usually use plumbing tape on them so they don't leak.