I'm not familiar with the lights you're using but I'm assuming they're LEDs? If that's true and your light is 4 - 5 inches away from the plants, that would be much too close.
Did you watch the GIF I send? It are a 600W, 630W and 900W LED. The second GIF with the text about it being close to the light, is at the 600W light.I'm not familiar with the lights you're using but I'm assuming they're LEDs? If that's true and your light is 4 - 5 inches away from the plants, that would be much too close.
Maybe someone else will have other suggestions but if i ever see the edges of my leaves turning up and know my feed is light (you said .9 EC, yes?), there's not much else I can think of. I don't use GH nutrients so i can't really suggest anything other than following their feed schedule. I don't know what style of hydroponics you're growing in but if you're able to have a look at the roots, that might be helpful. Other than that, I really don't know. Honestly, lowering the light intensity seems to be a no brainer. Is the EC of your reservoir rising or falling? pH?
Your plants will tend to start eating less during flower. If both your pH and EC are rising, you could probably lower your feed EC by .1. Sometimes this stuff IS indeed counterintuitive. Haha
Have you done a complete reservoir change? Might also be something to try.
this is correct and you need to maintain the rez. When water levels fall nutrient levels increase. ph gets more acidic and when you add tap water it will come back to proper readings and it will show how low your ec is. That is because the plant is eating nutrients. at your stage you should be at about 1.5ec lights 2ft away at 100%.,Thanks for your input. I will decrease the lights. Kind of counter intuitive since they're now producing buds.
But you might be right. 0.9EC isn't a lot. Couple of weeks ago they could handle 1,1 and were eating more. Then EC increased and I have lowered it to 0.8-0.9. pH always rises when I put new water in (5.5>6.2 pretty instantly). After that it normally increases. Last days, before todays water change, I closed of my tank from the main pot to fill the tank (I have RDWC) and as the water level dropped in RDWC, pH increased from 5.6 to 5.8. EC from 0.9 to 1.0 in 2 days.
stop killing the beneficial bacteria. You do not need to clean with every water change. Hell, i just upped my rez everytime the water level was down. I changed the rez water twice a month and sometimes in summer when i was busy, I wouldn't even change it. Just mix more nutrient and top it. You need beneficial bacteria for the rez to be stable.And every 3 waterchanges I make sure to empty the watertank (not the RDWC) completely and wipe it with diluted h202.
There are no beneficial bacteria in my watertank… I typed it out as clear as I could. There is no airstone in my water tank. If I don’t clean it, it will smell like death after 3 weeks! Again, Reservoir is NOT my RDWC system. I don’t use the word “reservoir” to make it clear in my comments, the difference between my main-pot and my watertank.stop killing the beneficial bacteria. You do not need to clean with every water change. Hell, i just upped my rez everytime the water level was down. I changed the rez water twice a month and sometimes in summer when i was busy, I wouldn't even change it. Just mix more nutrient and top it. You need beneficial bacteria for the rez to be stable.
I can’t higher my lights anymore. And bending the top branches isn’t really an option anymore to because they will jut cover other branches.this is correct and you need to maintain the rez. When water levels fall nutrient levels increase. ph gets more acidic and when you add tap water it will come back to proper readings and it will show how low your ec is. That is because the plant is eating nutrients. at your stage you should be at about 1.5ec lights 2ft away at 100%.,
bending the top branches, will just cover other branches. So that’s not an option. Like I said, the only options are cutting them or lowering the light density and with that cutting the overall harvest of all branches.The only way you're going to know how much light is hitting your plants with any amount of certainty is with a meter. Otherwise, we're just guessing. There's free lux meter apps for your phone but i've never used them personally. Perhaps someone can suggest a good one. Besides the 5-6 branches you mentioned, how close is the rest of the canopy? You could always try to bend the branches that are close out of the way. I've had to do that on a few occasions as well. You invested time and money into your grow, lighting is something you should get right.
So here's what we know about your grow so far.
pH: 5.6 - 5.8
Tank stinks after a while - not aerated
I've done RDWC buckets before but not on the scale as yours. I have no idea what is what's going on inside of your filling tank. I'd be concerned about the smell and funk but I've never had to maintain a tank that large so I personally don't have any advice. That said, I dont remember my DWC buckets ever smelling foul and wouldnt use water that smelled bad but my system was small and i'd do fresh water changes when needed. What is your filling tank's water temperature? This is something that definitely needs to be maintained if you aren't already. I would 'think' this should be aerated as well but i defer to the RDWC experts if this is necessary. More oxygen couldnt be a bad thing? Is your tank just stagnant water w/ nutrients and hydroguard? That cant be good.
If you're not using any beneficial bacteria, running a sterile system might be something to look into.
Have you tried running fresh nutrients NOT from your potentially stagnant smelly cruddy filling tank?
I only mention adding fresh nutrients to your RDWC just to rule out the FUNK in your filling tank.why would I add nutrients directly in to the RDWC? That wouldn’t make any sense. It costs time for the RDWC to mix it then instead of the tank slowly feeding it at a steady rate (aka, mixed instantly). My plants would have EC swings for hours when I add it manually. I’m sorry but I have no time to add nutrients for an hour on a daily basis…
The water temp in RDWC is 19C, I have a chiller. Water in tank is room temp.Wattage of your lights doesn't mean much. You need a measurement of the amount of light hitting your canopy but it is starting to sound like a potential issue with management of your fill tank. You should still optimize your lighting regardless.
I only mention adding fresh nutrients to your RDWC just to rule out the FUNK in your filling tank.
Every parameter of your grow needs to be balanced if you want a successful grow. It's obvious something isn't right with yours. Maybe someone who has experience with a bigger RDWC setup can give better advice but i think you need to optimize your lights and get your filling tank situation in check. Everything else seems reasonable. You didn't mention the temps of the feed water in your filling tank or in your RWDC, for that matter. Water temps are definitely important. Is your feed tank in the same space as your grow? I'm sorry, optimizing a grow space takes time, patience and 'usually' money. That's just the way it is.
I hope you're able to figure it out, we can only give suggestions. It's a process of elimination. Best of luck!
*edit* another parameter not discussed is your source water. Tap? RO? If tap water, what's in it? Starting ppm, etc.. I always recommend getting a water report to know what you're dealing with.