rust spots on fan leaves

hi peeps,my plant is getting some rust spots on fan leaves and it seems to be spreading im growing in biobizz allmix and using biobizz grow/bloom its two weeks into flower now but the spots was there before i started to flower,ph is 6.3 the run off is 6.4.any one no what the problem is?and how i can fix the prob cheers.

at first glance water burn with the light or maybe you could try cuttin back a little on your juice cause that could be fertalizer burn?? i've also seen calcium and magnezium deficiancies do simalar things?? its hard to say my eyes are blurry!!
love and respect!

burn cut back a day or 2

hi cheers for reply im using a 300 watt cfl so i shouldnt think its burning on the leaves could be cal/mag but im not sure maybe its lsf, leaf spot fungus but im no pro lol thats why im asking on here so hopefully some 1 will tell me the problem so we can solve it cheers m8.peace.

hi fruit what u mean cut back on the nuts a bit? cheers.

Looks like a cal/mag deficiency. I had something similar to pic 2 and it was because i was watering it with nutes and got a little splash on them. Hope this helps good luck.

hi mate cheers for reply,i dont think its splash on the leaves because its half way up plant too,it may have happend on that leave pic 2 but the rest of fan leaves have it half way up the plant.so you think it might be cal/mag if so how do i fix the problem?and is it defo what the problem is?cheers.peace.

I use MagiCal with every watering. I use RO water and it is too clean so I need to add mag/cal. There are many products out there and I have even heard of people using Epsom salt or something like that. Lots of posts with the same problem as you, little brown spots. It is an easy fix and new growth will not get it if you feed them right. The damaged growth may become worse or stay the same but it will not repair itself. Also pH lockout can cause this too if you pH is off it will not absorb the nutes. Good luck.

hi ok thanks ill look into getting some epsom salts or something and hope it sorts it out thanks again.peaces.