My ray's had no issues in the past with it's current inhabitants (peacock bass, a geo, and a silver aro) and I thought everything would be fine when I added a flagtail. I've been watching the ray closely to see if there were any "suck" marks on the disc that would indicate the fei feng had been attacking it. Nothing the last few weeks it's been in the tank but this morning....there were chunks missing from the outter diameter of the disc!
I'm not sure if it's the fei feng or if someone else is picking on the ray. What does a typical fei feng attack look like?! The ray has been kind of pale these last few days too...I'm going to check the water parameters tonight but nothing has really changed so I don't know... 
I don't know if I should move the ray to another tank or move the fei feng. I don't want to stress the ray out but I don't want to assume the fei feng is the problem and have the attacks continue from another fish.
Advice?
I'm not sure if it's the fei feng or if someone else is picking on the ray. What does a typical fei feng attack look like?! The ray has been kind of pale these last few days too...I'm going to check the water parameters tonight but nothing has really changed so I don't know... I don't know if I should move the ray to another tank or move the fei feng. I don't want to stress the ray out but I don't want to assume the fei feng is the problem and have the attacks continue from another fish.
Advice?

Then of course like alot of ray keepers the flagtail had to go..