Big sump! I like your planned modifications to it.

Thanks Mindy. Figured it would be a good way to use all that space for a good purpose.

I also removed the glass overflows. Friend bringing me some heavy duty starboard type material for both the bottom in white, {thinner} and black, {thick} for the overflows, instead of trying to cover the glass.

You can't silicone Starboard. Starboard is the same material as plastic cutting boards...it's less gluable than acrylic.

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

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.

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.

You're welcome. Assuming you mean 6 mm...that's not true. The black glass on my tank is 10 mm IIRC. I also have a kitchen table with really thick black glass - never measured it.

Could just be my supplier. They do have 10mm in smoked grey but thats not as dark. Perhaps I will order the 6mm and cover the clear glass with it..:smile:

Why not have the overflow built out of reg glass and silicone a veneer of the black glass over it?