dark patches on leaves

Looks like possibly P def. starting, but a clearer pic would help, as well as pic of whole plant and info about feeding, age, PH, and medium.
 
Cheers guys, it's a month from seed, in seedling compost at the moment, had its first neuts a few days ago, , and this appeared a couple of days later. Gave it a little cal-mag just in case. The dark bits have now one a rusty colour. Will try and get a better photo up.
 
Temps mid 70s, seeding compost, using a and b nutes, 600 HPS. All the other plants from the same seeds are cool, no problems, just this one.
 
Cal-mag, especially if you have soft water...the other plants may develop the same issue in time...or maybe reduce the nutes slightly
 
Athenry04 said:
Thanks for the ideas, I haven't used the bug spray, but will use some cal mag. Cheers
Click to expand...

Problem not getting better, and black spots spreading to leaves higher up. Still only affecting one plant, all the others cool.
Any ideas, or is this plant fucked?

Cheers again.
 

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Another plant is now just starting to show signs of the same thing, I've flushed both plants and just crossing my fingers now, as I have no idea what is up.
 
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