Brown spots of leaves

Lnp32

Member
Hi guys,

Growing 1 autoflower in a 2ft x 2ft tent.
Im in week 5 of growth and started the plant in bio bizz all mix.
Enough nutrients in soil to take it up until week 4 so gave a top dress of ecothrive life cycle and seaweed powder from guanokalong. Every other water ive used the microbial tea by ecothrive called biosys. I dechlorinate my water using ecothrive neutralise which is concentrated vitamin c to remove chlorine and chloramine from the tap water. I usually give the plant 3 litres of water and thats usually enough to soak the medium with a drop of run off out the bottom. Yesterday i gave 3 tsp of bat guano (1.10.1 ) by guanokalong as id estimate the plant is roughly in the second week of flower as its an auto flower its harder to guage.
Im growing in a 3 gallon pot and haven't ph’d the water since starting the grow as its in soil and im using organic dry amendments.
Everything’s been going well but ive noticed these brown rust spots on my plant and not sure what causing it. Its on a few of the mid section fan leaves but ive noticed it spreading to some of the upper sugar leaves now.
Its either something ive feed it or could be ph issue or maybe the fact that one day i let the soil dry too much before watering again and maybe its effected the microbial life in the soil.
Any help would be much appreciated,
Thanks
Pictures attached below.
 

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