Flatworm eating fish

[oilfieldsafety]

I have a 90 gallon set up with a 29 gallon sump and have been battling with flat worms for about 2 months now. I added a Flame Angel to the set up 2 weeks ago and noticed lastnight that my flatworm population has reduced significantly. I spent about an hour quietly watching the tank and noticed the Flame Angel eating every flatworm in sight . I am quite happy about this but a little surprised as I had not heard or read anything about Flame Angels eating these so I was curious if anyone else has seen or heard of this before.

Thanks
Shane