well hes not in terrible water. i have tested and it is within optimal range but their is quite a bit of algae. with my lights and no co2 that should be unusual. nitrates 20-40 ppm and ammo and nitri are 0. water is hard, ph is 7.2-7.4 i have an emperor 400 and an xp3 and water changes 2x weekly 25%. its a 100gal tank with 3 jd 1 dat 1 featherfin catfish 1 giraffe catfish 2 bristolnose all are under 9". with the smallest 2 being 3" most averaging 6-7". does anything sound wrong?the pics r so grainy, hard to see. but with any wound, u have to follow the Rule of keeping that fish in xtra clean water.
it can make the difference in which direction things go: healing vs possible infection, etc..
if you think it looks "off", any fungus or rot? increase your cleanliness efforts. & sometimes a little salt helps turn things back around too.
Thats why im not going to add any salt. their should be a little tiny bit of salt in there because the tank was brackish water like 2 years ago. water changes might have diluted that to nothing though. i will just increase the water changes to 10% every day. and sometimes 20% every other day incase i forget 1 day.Water changes and salt will heal him up just fine. Most plants don't like the salt though...