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Unread 11/17/2004, 11:35 AM   #13
rsman
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Join Date: Oct 2002
Location: Calhoun, Mo. USA
Posts: 2,239
umm ok well yes they can be gravity fed, and no the hydrogensulfate is a very much BAD thing it means that instead of consuming nitrate its consuming sulfur its also very bad for a fish tank, check out all the threads on hydrogensulfate in the chem forum, its the same problem with bad DSB's and plennums. it generally means you didnt follow the directions.


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