Here I am again, asking advice for a friend's tank >.< Lately his bait minnow has been a pain. about 5 days ago the scales on his back have turned white in a patch, it's not fuzzy, and it hasnt been getting better. I keep nagging him to do water changes, but after 8 months of nagging I finally gave up. I don't know the water parameters yet, I'll find out later tonight. Here is a pic though. Any ideas on what it could be? He's acting fine as far as I know. the tank has had the same residents for years and hasn't had any new additions. The only thing that has changed is that he changed out the substrate.
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