modelmaker66
I have seen sheets of grill material- I think it was from K & S, in their sheet metal racks. Don't know whether it is PE or die-punched. Don't know what your tank's grill looks like, exactly, but it is just a square pattern, then the only thing you have to worry about is the size/pitch of the grating. I have also seen fine brass screen mesh- I think it is for filters- from Small Parts.