Ok before I hit the tank with flatworm exit I would Like a 2,3,4,5 opinion, Are these the flatworms that are harmful ? Their size is no were near that of red planeria or yellows I have seen . These are the size of the eyes in this smiley face. I used a magnifying glass from a swiss army knife and my eye phone to take this pic. If they are harmful should I use the salifert Flatworm exit. Only noticed them on glass not on rock or corals. Corals seem great. Are they flatworms to i guess I should ask? Please I need an Id or should I leave them alone?