Ok my plants are about a week into flowering, strain is called ice, I have them under a 400w HPS and I'm using Biocanna nutrients along with organic teas from egg shells and banana peels and I adjust the pH to 6.3 - 6.6 (I don't have a TDS meter, please tell me if this problem could be over/under fert), the water I use is filtered and left for 2 days for chlorine levels to go down, the temp in the room is about 25*C (77*f) and the humidity is around 50%

I noticed this morning that one of my babies was drooping a bit and it has some yellowing in the centre of leaves, the drooping has been getting worse with time. I also noticed some little spots along the veins of a couple leaves (not bugs). The other plants all seem to be perfectly healthy.

Please tell me what could be going on and how to fix it, thanks.

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the primary trunk looks a bit thin... you may consider lowering the light a little. You may also want to try rotating it about 90-180 degrees incase it's just leaning to where it prefers to get the light from.
Mostly I'm just seeing a very thin trunk though.

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...flowering.

manganese?

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something like that.

more likely I think it has to do with the pH of your tap water or soil. do you have a pH meter to test runoff and solution before you feed?

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Thanks for that, and yes I have a water pH tester but not a soil tester, I've never checked the pH of the run off but I always keep my water around 6.3-6.6.

Oh well that is definitely a good range. I don't know about Biocanna but I'm thinking it may not provide all the trace elements... that or the soil may have had too much of some element.
I don't think it would be a bad idea to go grab some Elanor's VF11 and spray / water with it once or twice. Its not organic but pretty much just has trace elements in it. Otherwise get something organic with a complete micro content.

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