What are the signs of a fungal disease?
The spores of various fungi are always present in an aquarium. Normally fungus doesn’t attack a healthy fish because the mucus which covers a fish fights off infection. But if a fish becomes injured through bumping into a sharp object, rough handling or an attack by another fish, or if it has become stressed due to a poor environment, then the fungus could take advantage and gain a hold. Once the fungus as gained entry past the fish’s natural defences it will spread and weaken the fish further unless treated.
