Interesting that you lost no inverts. In the couple tanks Ive treated weve lost all the snails, also experienced huge hair algae blooms, probably due to the snail die off. One tank I had to treat twice as the blue snowflake polyps started coming back, the second treatment did wipe out the vermatid snails which was definitely an unforeseen positive affect, second treatment also took out the gonis in the tank as well as a large hollywood stunner. All and all Id say the treatments worked for what we were trying to achieve with just a few minor adverse affects.
It is worth noting the tank that was treated twice was completely overrun with the blue snowflake polyps. Im assuming with the amount of die off from the polyps alone may have been what contributed to the additional losses we experienced as well as the algae bloom. I never detected a NO3 or PO4 spike though, water chemistry stayed pretty consistent.
One of the other tanks I treated was prepped before treatment. All snails were removed and this tank only had a couple small patches of the red snowflake polyps, so not nearly as much to kill. Did not see the adverse affects in this tank at all, which house mainyl SPS with 2 very large sunburst anemones.
Just my added to cents based on my experience.