thanks, I have lost a few tetras but i dont think it's the rays. I have a fire eel in there too. I never see the rays chases any fish, they always get black worms.The retics are eating really well, they dont get out competed for any food at all. filtration is a oversized wet dry, 2 emp 400 and a rena xp3 . Water changes are done twice a week 50%. Ill try to get petter pics but i'm not great at taking them yet. thanks