LED nutrient deficiency

It seems that all of my plants that are under led, in flower, are showing signs of magnesium deficiency.
It is possible, although unlikely, that in ths batch of soil I forgot to put in any Epsom salt. This seems to be a consistent area of concern when using LEDs for me.
Not really a big deal as its easy to fix, just wondering, does anybody else have similar problems?

is it cold?

ryan1918 said:

is it cold?

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78 to 81 lights on and 66 to 71 lights out is an average. Sometimes a bit warmer, couple of degrees.

how many weeks in flower, and do you got any pics? they usually start showing signs of def at week 5 of flower

Around week 2 or 3 it seems to show up, I don't have any pics right now, it just hit me on the way to work this morning that consistently everything seemed to need a cal/mag supplement. Actually, I mix epsom salts with an iron supplement and water it in which takes care of any problems in about 2 or 3 days. So maybe I'm correcting an iron or calcium deficiency as well but that's highly unlikely with the composition of my soil.

Whenever I grow with led lights I always get calmag deficiencies. Something about led light that make most ladies calmag whores. Theyll do anything for it. But this is normal for me when using led lights. I usually just add calmag about one a week to counter these effects.

hotshotisdashit said:

Whenever I grow with led lights I always get calmag deficiencies. Something about led light that make most ladies calmag whores. Theyll do anything for it. But this is normal for me when using led lights. I usually just add calmag about one a week to counter these effects.

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Do you use tap or RO water?

I use rain water or melted snow.

jeroly said:

Do you use tap or RO water?

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I almost always use tap water set out 24 hours.

hotshotisdashit said:

I almost always use tap water set out 24 hours.

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i do the same

I don't think it's related to calcium.. just iron and magnesium. For some reason it's a common problem with certain LED grows.