Maybe someone has a problem like this and will share how to fix it?

[marynen]

Hello guys, by suggestions I'm now try to look for help in this forum.
First two season was great and now in season third started problem like this ( bellow in photos). Try every thing...ppm UP/DOWN...every N -up/down P- UP/down K - up/down.

So plants are under LED's
hydro DWC
ph 5.8-6.1
temperature 28-30 C ( using Co2 )
water temperature 20-24 C
Only problem that last 3-4 weeks humidity is 30%-42%

All plants as I understand has the same problem... maybe someone has had such a problem and can share experience on how to solve it?

 

[Stoned Ape]

Do your roots have any slime on them or smell a bit nasty.

 

[marynen]

Do your roots have any slime on them or smell a bit nasty.

almost all of them have nice snow white roots. Some have a smell yes. But they still white

 

[Stoned Ape]

If nice and white they are good. So that rules that out I guess. I am not great at defiancy diagnosis but u did see some purple on the stems which I think can be a sign of potassium def.

 

[marynen]

If nice and white they are good. So that rules that out I guess. I am not great at defiancy diagnosis but u did see some purple on the stems which I think can be a sign of potassium def.

Yes some have purple steams some dont...Leafs for all are the same but some have smeel in root zona... so root rot?

 

[Stoned Ape]

If stinky good possibility of root problem. Worth lowering the res temp a little. And a product like hydrogaurd to protect from bad bacteria that grows in warm water with low oxygen levels

 

[marynen]

If stinky good possibility of root problem. Worth lowering the res temp a little. And a product like hydrogaurd to protect from bad bacteria that grows in warm water with low oxygen levels

I have a pretty huge oxygen in res. Now I lower temperature in res to 25.5 C . And also humidity from 35-40 to 55-62 and now its turning better.
Maybe you what is the problem when steams stay hard? Potassium def?