Someone did tell me , I'm thinkin 5ml per 10gall, I'm sure google will brin something for you
http/www.fishforums.net/index.php?/topic/353246-raising-ph/
http/www.fishforums.net/index.php?/topic/353289-making-your-own-buffer/
http/www.fishforums.net/index.php?/topic/353246-raising-ph/
http/www.fishforums.net/index.php?/topic/353289-making-your-own-buffer/