whats up , I have a 125 gal ph is a steady 6.8 heat is a steady 79 deg. I have a 9 inch oscar a 7 inch jag and 7 inch gt and two little tinfoil barbs to distract from any fighting. I introduced the the oscar and jag two weeks ago, a few days into it i noticed a little mark on the side of the oscar. after a week now its gotten worse and its more like a deep hole now. i put the two tinfoils and the green terror in 4 days ago and the tinfoils have the same mark on there head. but the terror and jag are fine. heres a few pics. any ideas ?????
(there is some agression between fish but nothing serious for the most part they get along great)




(there is some agression between fish but nothing serious for the most part they get along great)



