Rust Burn or p/k deficiency?

At first I thought it was a cal def until I saw some newer growth with these brown spots also on mid and bottom fan leaves. As im doing more research on the blotches I see it could be p/k def or a rust burn?

Its only on one plant and It first started to appear after a 2nd foliar feed with MgSO4 n a row without foliar feeding with clean water to wash off excess epsom salts. Maybe light burned the wet leaves? I sprayed immdeiately after lights out.

And plant growth has stunted immensely.

20/4 Veg
Canna A&B
3ml calmag
Cannazyme
620ppm with RO
Ph 5.6-5.9
RH 65%
77-82F

And I flood once a day. Ive noticed they often seem to pray more than they did when I was flooding 2x a day....is that a good thing?

Sorry im a noob here :-)
 

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