Velvet is one of the most common diseases in aquarium fish & can strike down every inhabitant in the tank in a matter of days.
It is cause by one of several species of a tiny parasite known as Oodinium.
Symptoms: Scratches against hard objects.
Fish is lethargic Loss of appetite & weight loss Rapid hard breathing Fins clamped against body.
Fine yellow color film on skin In advanced stage, scales peeks off