I am currently dealing with MV and I have never seen any reddish areas like that.
IME the first signs were breathing issues with infected fish, then swimming awkwardly and scratching on substrate, whitish spots similar to ich became visible but the spots blossomed and got fuzzy, then spread all over the skin, then hiding, then dead.
The reddish area looks like an abrasion of some sort. I am not familiar with CBB's but are they good swimmer's? Could it have gotten sucked into a powerhead or something similar? Are there other aggressive fish in the tank?
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