Aquari-Sol is copper sulfate. That's not something that will work on a bacterial infection. It's used to treat parasites.... Does he have fuzzy white "cotton-like" growths? If so, this is either Columnaris or Saprolegnia.
Columnaris is a gram-negative bacterial infections. It's treated with a gram-negative antibiotic. I prefer the furan class for this. (API Furan 2, Hikari Bifuran or Jungle Fungus Clear.)
Saprolegnia grows only on dead/dying tissue. It's a mold/fungus. Look for thread or hair-like projections.
Most times, fuzzy white growth is due to Columnaris. (Unless there's a previous wound.)