GOLDFISH ATTACKED PLEASE HELP!!!?

i have a black moor, red telescope, and 3 gold fantails which were swimming peacefully in my 60 gallon tank, along with a congo tetra, and a bala shark. I went to my local fish store today, and asked the person working there, which tropical fish they carried, were non-aggressive towards goldfish. I also advised the worker there, that my water levels in the 60 gallon tank are perfect (ammonia,Nitrites,nitrates,etc.), and the temp is always at 76 degrees w/ a 300 watt heater. I bought 2 oscar cichlids, and was advised by this worker, that they are peaceful, and will be okay with the goldfish, when considering friendliness/aggressiveness. These two OSCAR CICHLIDS ATTACKED all of my goldfish (shredded tails, nipped fins, etc). I WOULD LIKE TO KNOW IF THESE INJURIES WILL HEAL, or if my fish will die due to the fact that they can not heal that particular type of injury? I have separated them into the 12 gallon Eclipse tank i have for now, and will move them into my neighbors pond in 24-48 hours, because she is kind enough to let me do so. Thank you for reading this and replying with serious, and knowledgeable answers.