Loss couple scales nothing to be concerned about they'll grow back. I had fish scrap large areas of skin and scales off there heads scraping the top edge of the tank. I had them damage there eyes long scraps down there sides. I seen alot worse then that and all heal back. I seen fish beat up torn up fins almost halve there scales missing heal back completely. Look at my avatar that is a bicher that got halve its face bitten off. Its all healed over now missing an eye and part of its jaw. Never got infected just healed over if you see it now its hard to tell at first glance but its missing an eye.