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+1 on the flatworms!! Siphon them out...I've heard mixed reviews on sixline wrasses...The Blue Velvet Nudi will rid your tank of them too, but that's all they eat.
you can but i have noticed that flatworms usually hide in low flow areas in the DT. now in my fuge they hang out on the glass since the flow is low. My Mandarins eat the flatworms in the display. if you do dose the tank be sure to run carbon afterwords and i would Re-dose after a few days to kill off any stragglers/eggs that may be left.
edit- I dosed my 400gal system with fish/coral/nems/ snails with no problems except i didnt have enough Flatworm Exit to kill them all.
If they are only on the frogspawn, do a FW dip, it kills the flatworms instantly, and does no harm to the LPS. Get a bucket of FW at tank temp and shake the frogspawn in the FW for about a minute. Just make sure the heads are closed up as much as possible. I have done this many times.
mandarins don't eat flatworms, they eat pods...the same food flatworms eat. by introducing a creature that competes with the flatworms for food, you can starve them off safely. i've had great success with this, but some folks haven't.