Deficiency/toxicity or heat stress

[Manganeze5]

Hi guys, I’m no expert but feel pretty competent. I started some kids about 30 days ago after redesigning my whole room. I have a RDWC waterfall system with ph controller, chiller, large air stones in each bucket with the waterfall ( not hard water flowing in just a nice gentle flow). Two 800 W light in a 6x9 room with lights dimmed to 50% (moved ballasts outside the space to reduce heat), two fans, air exhaust to outside, and humidifier. My current readings are as follows: ph 5.95-6 ( steady), starting ppm before adding nutrients is 110 ppm which is compensated for , humidity is 40-50, room temp flux is 72-79 F, water temp is 67-68 ( steady & controlled by chiller). I initially kept ppm pretty low around 350-400 for a while to let plants slowly build up without any stress.l. My issue is the plants have curling tips and the roots aren’t stretching into the water ( almost like air pruning). My oxygen levels are good, I had no issues last time with these stones and pumps. This was happening at 230 ppm when they went in after 3 weeks Also, I had my lights way higher initially (48”) and have now moved them to 36” or so thinking maybe lack of light, it’s almost like they’re stunted maybe, but I don’t think so. My initial though was heat stress or possibly nutrients being higher but I kept them so low for a while and only last week did I increase ppm and lower the lights to see if I could get em to go. The air gap between water and roots is like an inch maybe a little more, tips of roots are in the water. Maybe someone could shed some light based on the photos. Current ppm is 600. The roots have some nutrient staining but no foul odors, they are healthy. I’ve dealt with root rot, this doesn’t smell or seem like it at all…..any help to get them back on track would be helpful.

 

[LoveGrowingIt]

Do you have a light intensity reading taken from the crowns of the plants?

It looks like there could be some deficiencies. Mg seems likely, but too much light can look similar.

 

[trygrowup]

First thought was watering issue.
Then i realized it was hydro.
I'd guess people get a better idea if you could tell the distance of your light too.
And it could be nice to know how much of those roots are in the water.
Knowing nothing about it i'd say that the roots looks good and a bit strange at the same time.
Lets hear what the hydro guys say.

 

[elmoreno212]

she needs calmag.

 

[Manganeze5]

she needs calmag

Do you have a light intensity reading taken from the crowns of the plants?

It looks like there could be some deficiencies. Mg seems likely, but too much light can look similar.

i don’t have a light intensity meter, I’ll pick up and get back to you.. could be it

 

[Manganeze5]

First thought was watering issue.
Then i realized it was hydro.
I'd guess people get a better idea if you could tell the distance of your light too.
And it could be nice to know how much of those roots are in the water.
Knowing nothing about it i'd say that the roots looks good and a bit strange at the same time.
Lets hear what the hydro guys say.

So after I moved the light down and increased ppm last week, now I have nice white leader roots starting to come through the stained roots reaching to water and in water, so I think I solved that issue. I do add hydroguard and UC roots could be part of staining…

 

[Manganeze5]

she needs calmag.

So I’ve been adding Calmag, at 1 ml per gal, I have a 36 gallon system. Maybe I’m not adding enough, I also add the supplement into the system prior to nutrients to prevent any lock up. I have harder water and do add salts to soften it in my primary water system which goes through multiple filters, I’ll increase calm at to 2-3ml/ gallon and see it resolves the issue. Thanks for insight.

 

[LoveGrowingIt]

What is the pH of the water before and after adding the amendments?

 

[Manganeze5]

What is the pH of the water before and after adding the amendments?

My Ph of tap is 7.35- 7.45 prior to ph adjustment and adding nutrients.

 

[Manganeze5]

After… I’ll have to get back to you. Next time I do a water change won’t add any ph adjustment and will add nutrients to see what happens for swing.

 

[Manganeze5]

So after I moved the light down and increased ppm last week, now I have nice white leader roots starting to come through the stained roots reaching to water and in water, so I think I solved that issue. I do add hydroguard and UC roots could be part of staining…

I actually just realized im killing my healthy bacteria with the UC. I had a brain fart, last time I grew sterile, this time I was trying the hydro guard, forgot to eliminate the UC. Need to stop UC roots, I’m killing my bugs…

 

[Manganeze5]

So I’ve been adding Calmag, at 1 ml per gal, I have a 36 gallon system. Maybe I’m not adding enough, I also add the supplement into the system prior to nutrients to prevent any lock up. I have harder water and do add salts to soften it in my primary water system which goes through multiple filters, I’ll increase calm at to 2-3ml/ gallon and see it resolves the issue. Thanks for insight.

So after I moved the light down and increased ppm last week, now I have nice white leader roots starting to come through the stained roots reaching to water and in water, so I think I solved that issue. I do add hydroguard and UC roots could be part of staining…

So I have had some great success since I moved the light down I think that was the issue with the roots, I agree weird roots but looked healthy, look at them now, same plant….

 

[Manganeze5]

So I’ve been adding Calmag, at 1 ml per gal, I have a 36 gallon system. Maybe I’m not adding enough, I also add the supplement into the system prior to nutrients to prevent any lock up. I have harder water and do add salts to soften it in my primary water system which goes through multiple filters, I’ll increase calm at to 2-3ml/ gallon and see it resolves the issue. Thanks for insight.

So I have had some great success since I moved the light down I think that was the issue with the roots, I agree weird roots but looked healthy, look at them now, same plant….

Also, the new growth looks great now that I increased the calmag, check em out

 

[Manganeze5]

Thanks again for everyone’s help, this one had me scratching my head. You’re all professionals, in my eyes!