Wtf Is That? Brown/rusty Patches

[kenmastazz]

Hi,

I've been a soil grower and this is my first time trying Hydro.

- Im using a 9L DIY DWC Bucket
- Strain: CBD Crack(Fastbuds)
- RO Water with 200ppm AN Sensi CalMag (4-0-0) 3.2%Ca 1.1%Mg
- Maxibloom Lucas Formula my solution is 900ppm(including calmag)
- checking pH twice a day not much to adjust is always between 5.7-6.0

I top off and changed the water once after flowering

I had a small spider mite problem trimmed all the affected leaves and it seems to be under control. The roots are looking fine no brown/ish tips.

From the look of it I would say calcium deficiency but Maxibloom+Calmag must be enough so it has to be a lock out but im not sure...would appreciate some advice.

Thanks!

 

[4plant]

How often Are you doing a full res change? plants use different minerals in different amounts during certain times of the cycle just because your PPM’s reading 900 you could be depleting calcium more quickly than other elements that are keeping your PPM high. You should be doing a full change out once every 7 to 10 days in a small system like this.