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I've used lanthanum for years in my reef tanks without problems of any kind that I'm aware of.
I dose it via a slow drip directly in front of my skimmer input. I personally would not add large amounts all at once nor directly in the tank itself as I don't want the precip in the tank.
As Randy mentioned you do want to keep an eye on your alkalinity when using it. Like any other new product you try for the first time, go slow and try it several times using small amounts and look for any possible troubles in your live stock and water chemistry.
Carlo
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