[Randy Holmes-Farley]

I'm not a fan of lanthanum for several reasons. The first is that I do not know whether the elevated levels of lanthanum that may result in the tank water are totally benign for every organism we keep It may be, but it may not be.

My bigger concern is that the lanthanum phosphate is not actually removed from the system. Perhaps some is skimmed out, but I expect a lot of it just piles up on the bottom of the tank. It may become available through various processes (like passing through the gut of a sea cucumber), so I would prefer to see it actually exported. I have the same concern with dosing soluble iron to bind phosphate vs using GFO to bind phosphate (which is exported).

All that said, it may be a fine way to go. Much to my dismay, since it competes with my products (Renagel and Renvela; sevelamer hydrochloride and carbonate), lanthanum carbonate is used in people to bind phosphate from the GI tract.