Here is a quetsion for thoes who have big experience with silver sharks. Why do my silver sharks always have to smash them selfs against the top glass of my tank and (DIE) ?????????????? I had three silvers that were perfectly healty for over two years, and at 4.00 am they didnt want to live any more I quess ? They started to smash them selfs against the glass. This is the only fish that I cannot keep alive why ?????????????