What other things will dosing lanthanum chloride affect?

[laverda]

Something that hasn’t been mentioned yet on this thread is that lanthanum chloride is dangerous for the fish, it can cause cause fish to die as it can cause breathing issues, I would keep a filter sock on the output of the skimmer just to be safe

I mentioned it as. It becomes more dangerous as PO4 is depleted. When PO4 is depleted it will participate Ca which is much more dangerous to fish. It really is best to dose into filter socks or some other filter media.