While it will not relieve your problem completely, as Mykas instructions will certainly put you on track to do, bumpin up your flow will reduce thier numbers significantly.
I used to have them as bad as you judging by your pics but when I added another 80% of flow in my tank they became barely noticeable and only visible in cracks and pockets where the water movement is minimal.
I have read of people bumping up flow and then adding a biological solution (like a wrasse) until they are all gone to the eye and then putting flow back to normal with good results.
I have also found that Blue Velvet Headshields can really do a number on these things and since this particular flatworm isn't detrimental unless concentrated in large numbers you wind up with a sustainable diet for a pretty cool reef inhabitant who needs these flatworms as a specialized diet.
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