For minor injury...fresh water with frequent water changes in his display tank may be all that is needed....if a secondary infection has appeared or a major and/or missed injury-
Aquarium salt 1tsp/gal, tannins-along with 100% daily water changes for 10 days while in QT floating in a heated tank to maintain water temp in the 76-77F range
Pre-mix the treatment water in a 1gal jug of dechlorinated water-add salt and tannins and use this water for the 100% daily water changes for 10 days...pre-mixing can make the needed water changes and correct dosage easier and give the tannin source more time to steep so every day he will get more tannins with the water changes......
The "scratches" are on both side of his head. They seem to come and go and the are in the exact same place on both sides of his head... Ithink they are just natural coloring. This thread has like 80 veiws so please respond if you have any input.