Rust spots on auto flower

Hello guys I have an auto gorilla glue that is about 4 weeks old. It’s starting to get rust spots on the leaves. There seems to be several things it could be was hoping someone may be able to help me troubleshoot the problem.

My environment -
Tent 32 x 32 x 63
2 2000 w led lights
Doing DWC but I have a water pump in the tank that comes on daily to mix the water solution
2 air stones in the tank

Nutrients I use ( not all at the same time)
Sensi grow a and b
Sensi bloom a and b
Voodoo juice
Cal mag +
Epsom salt

I have been refreshing the tanks PH weekly. I set it to 5.5 and by the time I refresh it’s usually around 7.0

I have another auto flower which is critical purple. It looks fine so far. I also have a non auto which is tombstone that is in the same DWC. It has pink stems so maybe calcium deficiency or something?

Strange you never got a reply from anyone more experienced. I’m not a pro by any means but from what I hear, rust spots are a sign of low cal? Seems like you’re giving that to her already though…hmmm