I seen it too but I think it was in last months Aquarium Fish....I don't think is it necessary it just has salts that would be present in their native waters likely.
_________________
"There he goes - one of God's own prototypes -
a high powered mutant of some kind never even considered for mass production.
Too weird to live, and too rare to die".
Fear and Loathing in Las Vegas
Subject: American Cichlid salt? 
