Box, acrylic or or glass

[MixedFruitBasket]

I'd like to find a rimless 5 gallon, glass or acrylic box. It doesn't have to be an "aquarium" because it will be placed inside of a sump. It doesn't even have to reliably hold water, I just need a submersible box, with nothing but the glass or acrylic.
I've seen some flower holders but non are large enough. I really need it at 5 gallons no bigger than 7. Thanks

 

[siggy]

The ato topoff glass boxes from red sea would fit the bill

 

[MixedFruitBasket]

The ato topoff glass boxes from red sea would fit the bill

Is it square? I can't use it if it's tall and skinny.

 

[destro]

Got this as a gift over the holidays. Smaller than 5 g but actually thought of using it for holding corals.

 

[Silent]

You can find the little 5.5 gallon aquariums for cheap ($13.99) at petco

 

[siggy]

Water box has a 5 gallon cube,

 

[MixedFruitBasket]

You can find the little 5.5 gallon aquariums for cheap ($13.99) at petco

Yes, if I can't find a box that's rimless that's probably the way I will go.