My flagtail had been chasing around my odoe trying to suck on his scales and recent starting to do the same with my GATF. Could this be the damage of the flagtail? I'm thinking he catches him at night when the GATF settles down and "sleeps". Or could it be someone else doing the damage with the lights off? Maybe black aro, odoe, silver dollars, or gar but I haven't witnessed any other scrapping between tankmates. 
