T
Tattooguy8
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- Feb 9, 2026
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Been lurking for years finally decided to ask some questions!
Been battling magnesium deficiency looking issues with slow growth and poor root health for a few years now and I just can’t figure it out.
Current situation
Peat with 30ish % perlite
Gh flora series at 2.0 ec. 2.5 ml of
2.5ml Cal mag included in ec
Ph 6.5
Room temp 84
Leaf temp right around 78
Rh 55-60
Ppfd between 150-200
24 hour light cycle in veg
Lights mars hydro fc4800 7’ off the
At 20ish percent
Using ro water at the moment
Been doing this since 96 under hid of course. A few years ago bought a new house and decided to go led. Problems ever since, especially in veg. Magnesium sick spindly, stretchy purple stems. I don’t flower sick plants but if I throw those same sick plants in my flower room in a week they will look so much better with no other changes. Not perfect but acceptable.
I’ve tried everything. Low ec, high ec, tons of runoff, no runoff, 50% drybacks to just at wilting drybacks. I’ve tried coco and peat. I even went back to cmh. Still had the issue but it was slight. Almost impossible for me to get above 250 ppfd in veg. The only thing that kind of remedies the issue is a super high ec. Like 2.5-3.0. I don’t know how everyone can run 1.4-1.6 ec at 400 ppfd at 78 degrees. My plants would literally be dead. I’m obviously having either a root zone issue or transpiration issue or both.
Another related issue, I sprout seed under a t5. Beautiful green growth with super stacked nodes. As soon as I move them to the LEDs the don’t grow new nodes they just stretch their asses off. I have to top them multiple times till they slow down and start to actually grow.
Having to add so much heat into my veg room and still have sup bar results is starting to get old. My plants would literally be dead if my room isnt above 80 degrees with a super high ec. I feel like I’ve read every leveant thread on the internet but there’s no solution. Everyone just disappears. I’m betting they go back to hid.
Sorry for the long post. Please help.
Been battling magnesium deficiency looking issues with slow growth and poor root health for a few years now and I just can’t figure it out.
Current situation
Peat with 30ish % perlite
Gh flora series at 2.0 ec. 2.5 ml of
2.5ml Cal mag included in ec
Ph 6.5
Room temp 84
Leaf temp right around 78
Rh 55-60
Ppfd between 150-200
24 hour light cycle in veg
Lights mars hydro fc4800 7’ off the
At 20ish percent
Using ro water at the moment
Been doing this since 96 under hid of course. A few years ago bought a new house and decided to go led. Problems ever since, especially in veg. Magnesium sick spindly, stretchy purple stems. I don’t flower sick plants but if I throw those same sick plants in my flower room in a week they will look so much better with no other changes. Not perfect but acceptable.
I’ve tried everything. Low ec, high ec, tons of runoff, no runoff, 50% drybacks to just at wilting drybacks. I’ve tried coco and peat. I even went back to cmh. Still had the issue but it was slight. Almost impossible for me to get above 250 ppfd in veg. The only thing that kind of remedies the issue is a super high ec. Like 2.5-3.0. I don’t know how everyone can run 1.4-1.6 ec at 400 ppfd at 78 degrees. My plants would literally be dead. I’m obviously having either a root zone issue or transpiration issue or both.
Another related issue, I sprout seed under a t5. Beautiful green growth with super stacked nodes. As soon as I move them to the LEDs the don’t grow new nodes they just stretch their asses off. I have to top them multiple times till they slow down and start to actually grow.
Having to add so much heat into my veg room and still have sup bar results is starting to get old. My plants would literally be dead if my room isnt above 80 degrees with a super high ec. I feel like I’ve read every leveant thread on the internet but there’s no solution. Everyone just disappears. I’m betting they go back to hid.
Sorry for the long post. Please help.