Yes that is lps eating flatworm and will wipe out your lps one by one. They lay eggs on the base of the coral so you will need to dip coral and remove as many eggs as you can get too. I use tooth brush and bone cutter to scrape if needed. It's best to redip around every 3 to 4 days to catch newly hatched ones. 2 to 3 dips should be suffice.
I use a combo dip of revive and iodine. Highly recommend it.