In rec.aquaria.tech Devi [email protected] wrote:
Anyone point out any pros and cons of sticking green slate directing on to
inside glass of 3' tank as aquascaping (using silicon of course). Will glass
support it? Would quite like to make some ledges etc too.

nitpick
Silicon is a hard glassy lustrous semiconductor, silicone is a compound of
this that's not, and can be made into sealants/...
/nitpick

The glass will support it just fine, as long as you don't go way overboard,
I'd hesitate before going much beyond twice the thickness of the glass.
Ledges also can work, but if you're thinking of something thin jutting
out into the tank, silicone may be too weak to work, without support.