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Mineral deposits on glass?

I've got a 55 gallon tank with a broken (missing) center brace.  I made a 
relacement out of three plys of 1/4" glass and used silicone cement to glue 
it in place.  The "footprint" on the front and back tank panels was 
2.5"x3/4".  When I filled the tank; the bond didn't hold.  Should it 
have?  Was the bonding area large enough or could the glass not have been 
cleaned sufficiently?  What can I use to insure removal of the mineral 
deposits along the water line?  Would a strong acid solution (ie: battery 
acid) work?