Just as an update for those following. After the third treatment, the other cleaner shrimp died, (too much of a coincidence for old age, so, I'd say, if you're going to treat, pull them out). Lost a few snails as well, and almost all of my bristle worms
. The down side is that now I have to deal with dead bristle worms, (and try to remove the ones that I see sticking out of rocks). Hydroids seem to be all gone as well
. Here's hoping I won't have to do this again.
Robert