Know what the second most abundant ion in salt water is doesn't increase or decrease you ability to run a sucessful tank. I'll chalk one up for practical knowledge and experience over chemical book smarts any day.

I admit, it is good to know, but not necessary.

ANd yes, I am making up excuses because I scored ridiculously low on the test. :mrgreen:

newbie =(

Novice. But that test made me feel like an idiot... :)