

Spots on older fan leaves
No sign of a pest problem. I have been struggling with water temps and bacteria. I just ordered hydroguard. I'm leaning towards Septoria.
Info
Indoor grow
Sf2000 at 75%
Flora series with cal mag
Ec 2.0
Ph 5.8
10mil of cal mag in 3.5 gallons of water. A full dose should be around 17. It calls for 5 mil / gallon.
Water temp 75°f
Air stones and fans.