Also worth testing for copper. (This may not apply to you since you have a new tank but for others buying old tanks this can be an issue if it was ever dosed with copper. )
Another possibility is something metallic rusting in your setup. I recall another member finding a rusted blade which was...
I have dosed it straight into the tank. I have read of some reports where snails were temporarily stunned after dosing but I have never observed the case.
If you are referring to lanthanum chloride, I have used it. It does make your water a bit cloudy but it dissipates after it is mixed.
Brings down the phosphate levels dramatically.
Someone typed in the list of names instead of cutting and pasting. I noticed a couple of screen names are wrong mine included. I hope the items ordered were not messed up as well.
Post #110 messed up the list