By the looks of it's tail and fins it took quite a beating.Updating to get more identification/confirmation.
The CBB looked like it was doing ok. Was exploring the tank, and picked at rocks here and there, but was noticeably weak swimming last night - would float backwards even in lower flow areas and then swim forward.
This morning I found it on the bottom on its side breathing hard (like it’s exhausted).
I pulled it out and put it in my QT that I have chromis currently in - it tried to swim, although it looked disabled swimming contorted and sideways. I went to try and prep some baby brine to pipe directly into its mouth but by the time I got back it had passed.
Here are the pics of both sides to see if there’s more of an ID that can be made.
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Sorry for the loss .