The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
Looks like May have resulted from a fight, like a bruise or something. A couple of mine had something similar and they gradually got worse where it started to turn white! I freaked of course. Researched online and found salt treatment to be least expensive and least harmful to treating the tank with everyone in it. 1 teaspoon for every 5 gallons. Did it 3 days ago and they're much smaller, no white, and almost healed. Look it up, seems to be very beneficial actually. After my obsessive googling I "diagnosed" columnaris I think is how it's spelled. I post a forum for it on here. Here's what my started looking like to compare to yours. The 2 photos are the befores - when it looked like a bruise and then with the white.