[daisycutter]

a qestion and a warning about flint i use this in my tanks as it inert(its volcanic glass)it comes in bizzare organic shapes and for me its local but the waring is that were its broken off it cuts glass like butter and cuts very deep is there any way to remove scratches from glass thats going to be submerged

 

[Lupin]

I would just avoid the use of razor flint rocks. Anything with very sharp edges can scratched the tank easily. There's no way you can remove scratches from the glass if that's what you certainly mean. IMHO, I would just avoid such rocks completely.