Hi everyone, me again I woke up this morning saw my little guy with a red spot on the left side of his body. Does this looks like a physical trauma? Or this is an ulcer caused by bacterial infection? I am pretty sure my water parameter are within normal range (will update the details when I got home), he is currently in a 10G hospital tank, and I do 30% PWC every other day. He is currently being treated for a dropsy relapse I mixed 1 measure of Seachem MetroPlex + 5 measure of Sechem Focus with Repashy Soilent green, and have been feeding him with cooked garlic. There are about 1 measure of MetroPlex, 1/2 tsp of Epsom Salt and 5ml of Seachem Stress Guard in the 10G water with him as well. Yes he is still alive, don't question me why I haven't put this poor soul out of his misery, he acts so normal and swims around begging for food like nothing had happen to him :\ I can't just flush him down the toilet when he is still enjoying life We have been battling relapse for about 5 days now, at one point I almost lost hope and was ready to say my goodbye, but he turn around and start getting better on the 3rd day! 0_0 Anyway, my question is how do I treat this if this is an ulcer? I did some reading, and apparently I need to apply some hydrogen peroxide with Q-tip on the wound......how do you guys do it? I mean......how do you hold a fish down? (He screams bloody murder every time I lift him out of water -_-; ) And do I leave hydrogen peroxide on for a little time before put him back in the water? (how many seconds?) I find it a little hard to believe that there are still enough bacteria in the water to cause this :| What are the chances of this being a physical trauma? I am eyeing that heater in the background very hard, is it possible that he got burn because he got too closed to the heater? Or he got caught in the tight space between the heater and the glass? I am thinking about putting a guard around it, is it safe to do so?