Have had these flatworms before (approx a year ago) and they disappeared on their own after approx a week. They have returned, been sustained for like 3 weeks. Appears to be thousands of them. They are attracted to the lights when they’re on, they move up the glass to the top until lights out. No corals stressed. Currently running a fallow tank for another 49 days... first thought is red planaria but I don’t really see 3 points, just two. Anyways, thanks!
Quick Flatworm ID help please.
- Thread starter Sstadler
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Don't remember the name, but like I know they are completely harmless. I don't know why they come, but I had them before (few months ago), and they appear back again on the glass mainly after I clean and scrapp all the algae from the front glass. On the rear glass where is still coralline algae and another one to feed all the collonista snails they aren't on it 
I don't have wrasse/s only 2 clownfish, I'm mainly fishless. But they appear alway after I clean/scrap the glass, and probably nea bacteria film is build up (probably they are after the bacterias. I don't see them over anything else, and don't see anything to be harmed yet.
Not sure do I want to put and wrasse, as I have so many invertebrates, which will become wrasses food
