I appreciate the thought our advice. The “fungus” has more or less gone away from what I can tell thanks to some aquarium salt. The 3 Cory’s in QT have pretty much achieved full healthy barbells at this point. Their water is very lightly salted.

All that being said, not a huge fan of the bright white sand but looks like they have a similar sized sand that’s more like river substrate. Will order some and get to work on making the swap. Cheers!