I dont have arcros, i know the tiny clear type is bad but are the big ones too.
i think it was a hitchhiker from the swap so it may be the only one for now
Will it hurt anything i have
SHOULD I TAKE IT OUT???
There is more than 1 type of flatworm; not all eat acropora corals. Read the info on the link I provided. That page also gives you more information on their control, reproduction and additional links of information.