woke up this morning and my yellow tang was struggling to get away from a group of hermit crabs, i was able to get them off but they had already torn one fin off its side and took one side down to the meat. I put him in a QT tank but he passed shortly after

was just wondering how they could have gotton to him?????

he was fine the day before
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75 Gallon Rectangle
40 Gallon Sump/Fuge, 2x150W HQI MH
2x96W True Actinic 03 Blue, 4 Blue Moon-Glow LED
Coralife Skimmer, 950 Mag drive Return
4 Maxi-Jet 600's, 100 lb. L/R