Flat worm.
Flat worm.
I had a flat worm similar to that. I say similar because coloration is not the same and mine did not have bristles.
I did some reading and found out that most of those types are predatory. I have since caught mine and put it in a 5 gal fuge tank.
I have seen mine eat a snail.
If you are going to kill it, please don't, it is an interesting animal, I will be happy to take it. I can pay you for shipping it.
Yili