I do not doubt your experience. I believe that your account of what happened did happen.I dosed about 10 drops of Lan Chlo as Blue Life RX directly to my DT tank to chase my number down to around 0.1
Over the course of 6-8 weeks it started a MELT of 12 strains of zoas and lost about $1000 worth of replacement value
I blame it on accumulating Lanth Phosphates forming and settling out in the DT. Then consumed by zoas that cause them to melt (?). My THEORY....
I NOW use Lan Chloride only in the sump where the exchange of chloride to Phosphate chemically can be collected thru a filter sock
LOSS OF LPS CORAL IF LANTH PHOS IS FLOATING AROUND THE SYSTEM
I do not think that 10 drops of Blue Life RX was the root cause of your zoa issues 6-8 weeks later.
You did not specify but I will assume the "worst case" scenario here where you dosed 10 drops (0.5ml) every day for 8 weeks straight.
That is 560 drops or 28ml over 8 weeks.
I do not know what your water volume is. But let's say that it is 10 gallons or 37854.1ml.
Let's add 28ml of Lanthinum Chloride to that.
37854.1ml + 28ml = 37882.1ml total water volume.
So that is 99.92608646% artificial sea water and 0.0007391354% LaCl.
This is assuming you were dosing into a 10 gallon display tank.
Again assuming the worst case scenario where none of the Lanthinum Chloride was bound up and 100% of it was free in the system to wreak havoc.
It doesn't add up to me and is not consistent with proper implementation of the product.