Actually Phil just because something has not been approved by the FDA doesn't mean its not food safe. It could just mean the manufacturer didn't spend the big bucks to get it lab tested.
Really want to risk sucking down a bunch of chemicals? If the manufacturer had any integrity, they would get it approved, but aquariums don't fall into food fish concerns, nor the chemicals used.
Anyway, not going to argue about anything, just pointing a few things out and see what happens.
