I came across one study in the past that demonstrated free lanthanum chloride clogging the gills of daphinia and accumulating on the outer membrane of certain bacteria.
Also, once lanthanum chloride binds to phosphorous and settles on the substrate, if it is injested into a fish's gut, it can become free again in that low PH environment and be re-released into the water column as it passes through the fish.
With GFO, it can remove trace minerals, so it has it's drawbacks as well.
I found that you had to dose very little LC into a 10 micron sock to be effective. You don't have to run your whole sump return volume through the 10 micron sock. When the sock overflowed is when I changed out the sock.
I found no actual studies on larger fish being negatively affected by a cloud of LC, only anecdotal evidence.
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Mitch
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