today while i was at work my flowerhorn injured himself pretty much right around his anus. it was most likely on a piece of driftwood that has since been removed from his tank. i did a 75% water change and added some salt to keep the wound clean. he seems to be completely alright aside from the wound and doesn't look particularly stressed or anything. a couple pics of the wound are below and if you have any other recommendations for treatment feel free to share.