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What is your light cycle? You sure your lights are going off? Any light leaks into the room during dark cycle?

They look super heat stressed, but I can't believe that floros can do that. Humidity must then be way to high. Need to get that down. Are you supplying fresh air? Air you exhausting hot air. Are you watering on a regular schedule or when they dry?

Seems like you on the right track to fix you problem. If you still continue battling high temps, try adding CO2. Plants handle higher temps better with a higher level of CO2. The only problem you might have is that you exhaust 24/7, which will suck all the additional CO2 out. You might have to...

Yes, low PH will lock out Mg. Can also be caused by not having enough Mg in your base nutrient or the use of distilled or RO water. Also excessive potassium, calcium and phosphorous will make it difficult for plants to take up Mg.

Leave your PH. It is in range to absorb Mg. Try and get some Epson Salts from a pharmacy. It's dirt cheap and does the job!

Point taken, but i think It makes sense to run it for longer, just at half the strength recommended on the bottle. Call me stubborn but I don't believe plants only use more P&K during only 1 week of flower. On a different note, I just purchased H&G's Top Shooter which i'm planning on replacing...

Sticking up like that is normally a sign of wanting to be closer to the light. Check your temps though cause they look a little heat stressed.

Little black flies are probably Fungus Gnats. You need fly strips to hang up in your room to kill the adults. There is a product called Gnat Off which works wonders but it only stops the larvae from feeding and don't kill the adults. Thats what the strips will be for. They are attracted to wet...

Your temps are slightly high. Try and get them down a bit. To raise your humidity just add some water in a bowl to your grow room. But be sure not to raise it to much. Should be around 40%-50%. Keep the light cycle on 20/4 as autos grow so much better under more light. Overwatering causes low...

Agreed. MJ don't like major changes below, so try and keep things stable. PH should be 5.8-5.9 (you can go out of these ranges but it's not ideal) and a gradual increase/decrease on EC/PPM. At PH 6.0-6.5 you locking out Mn & Ca which could be causing your spotting together with fluctuations...

Check for tiny white bugs under the leaves. If you got them, use neem oil.

Interesting, do you perhaps have a link to the Uni Study mate? On a different note, your Avatar is disturbing :)

Thought I would post a pic. Strain is white widow. How do they look?

So it seems from everyone's replies that running pk boosters almost throughout flower should be alright. I'll do the same. Any cheap hydro carbo boosters that works a treat? Cheers for the help!

That's what I thought. The only difference I think is that the hammerhead might be more readily available in hydro; but I might have the wrong side of the stick. It's my first attempt again at hydro after a 7 year break from it and there is so much I need to remember. I really want to go get...

Cheers stelthy, how long do you use your 9l18? Also what makes it better?

Cheers man. I'm doing a 8 week strain and been running pk13/14 for the past 5 days. Just been wondering if I can run it longer than the recommended 6 days. Can't think of any reason why not. They at 4.5 weeks flower and looking really nice.

Hey there. Any one know why you only suppose to run Canna PK13/14 for a week during flower and not any longer? Has anyone maybe used it throughout flower and experienced any issues or even great results. Any help would be greatly appreciated.

Think max316420 might be on to something. Your plants are really dark green. Plants at 7 weeks flower shouldn't really be that green.

You need to flush them mate. They look really burned by too much nutes.