Quote from the above article: "Only consider purchase of fish that are eating and show convex, not concave bellies. [...] Should the fish have been so starved that eyes appear sunken, it is unfortunately dead but does not realize it yet. These fish do not seem to recover even with the best of care under ideal conditions."
Oh, poor fishy. I hope there is another possible cause....
If you still have your second pleco in that tank, does he exhibit the same symptoms? Are you feeding them algae wafers and veggies?
Gosh that's sad. I'm sorry.
