Rust colour patches

Rastaman85

Active Member
Got some small rust coloured patches on a few leaves on 1 of my critical cheese autos. I have 2 and 2 blue kush, fed them all the same etc but this is the only plant that has it!
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They are just over 5 weeks old, grown in biobizz light mix with all biobizz nutes, grow bloom topmax & heaven. Also added 1 teaspoon per L of Epsom salts last feed as they were starting to look pale with yellowing on lower leaves. Any ideas? Last feed was 2ml/l grow 1.5ml/l bloom 3/4ml/l topmax 1ml/l bioheaven & the epsom salt. Started v light & built up to this. Started 1/4ml/l grow.
Thanks in advance!!
 
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