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50 ppm and AEFW die. I tested it on a few worms, isolated and the effect is visual, within a min. At 30 ppm, they looked still looked at ease... i didn't want to wait to see what happened, I jus upped the dosage. It wasn't any extensive test, as I was doing an out-tank treatment for AEFW on Salifert's FWE and TMPCC then, and wanted to finish the day.
You could test for it out for yourself, only use a very white base bowl. At my 50 ppm, and 1/5 inch deep, the FWs are barely visible.
I did dip entire rocks under PP, some portions of the solution did touch on the base of the corals, no loss of colour observed. Coraline survived and so did some pest xenia. The rocks were rinsed in clean salt before returning.
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