Another available option:
Try dropping the salinity suddenly. Remove any live animals like fish, inverts, and corals and drop the salinity, wait a couple hours, vaccuum up the bodies do a water change and add some carbon--re-raise the salinity. You can dip the corals in something like Lugol's or Tropic Marin Coral cure according to the directions on the box to get rid of worms taking a ride. Personally I would freshwater dip the corals (dip into freshwater, swish 2 seconds, repeat once and return to proper salinity) but this is not a practice without risks (your coral could die).
Flatworms don't like salinity changes and FW Exit, while a good product, is quite expensive.
You can also kill flatworms using levamisole. (do a search in the reef section for levamisole I bet it comes up with details). I used the salinity drop coupled with the levamisole and water changes on the club's nano and it worked really well. Since you don't have much in the tank yet it is not as much of a risk to try this treatment because you don't have much to lose yet. Levamisole will kill inverts such as shrimp, snails, brittle stars etc. so remove anything you care about. (Be aware that you could still get hitching flatworms hiding on and in the shells of inverts you've removed.)
Pretty sure you can get FW exit through the Reef Shoppe and maybe Red Coral?
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