Best Sea Salt for Reef Tanks?

[MarkoD]

Originally Posted by Cal_stir

I was using IO until I read an article in RK magazine that tested several salt brands and found IO to be very high in the heavy metals, hundreds and thousands of times higher than NSW.

cant trust everything you read. you never know who's paying this magazine to write this article.

there are many people that use IO and even if these heavy metals do exist, they dont seem to harm anything in the tank