1~What type of fish is afflicted? several Rainbowfish have patches of missing scales along their sides.
2~What are your tank parameters (ammonia, nitrites, nitrates, temp, pH)?
pH: 7.0
Ammonia: 0
Nitrate: 0
Nitrate: 5
Temp: 26°c
3~ How large is the tank? How long has the tank been set up...