Thanks! I'm not too worried about the larger loaches (6"-8") but I did recently lose the smallest loach (3.5") to the female stingray. I didn't want the loach in there but I had to remove my smaller loaches from my Geophagus tank cuz they were interrupting the Geos from spawning. I still have 3 x 4.5"-5" loaches with the rays. I just try and keep the rays well fed. They actually have troubles eating a 3.5" cichlid. These rays have lived with most of this stock for 10+ months now and so far so good with only one lost small loach.