yup...I had 2 types of them as well..the red ones and the white/clear ones...oh i won't let them get out of hand ever again..I already dealt with the biggest flatworm problem imaginable 6 months ago

ugggh.. Flatworms AGAIN ...like I have to treat my tank once a month for flatworms, how can they keep coming back???

Okay this is not an answer. But even with the most aggressive treatment some still survive. Look at pods I nuked an entire aquarium full of live rock and they came back. Worm populations get out of control because of food supply. You might want to review what you are feeding in the tank Or I have heard that you can freshwater dip your live rock to nuke FW's.

i think the next dose with Exit i'll put more in. fw dip isn't an option..i have 300 lbs of rock