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Oh the new growth is starting to look light green/yellowish as well.

Alright I did a rez flush until there was only around 100 ppm in the runoff water of my rockwool's. Then made a fresh rez at 3/4 strength. The leaves that were clawed are now progressing to turn more yellow and the dark spots became more apparent rust spots. Trying to get some pics up, but...

Anybody have/had similar problems?

Forgot to add my temps are 72-82 F, runoff ph 6.0-6.3, and rez ph 5.8-6.1. I'm going to flush soon as I'm done typing this. What to do next?

^^^ Damn never knew that...good looking out man!

Can't get any clear pics with my iPhone cuz the HPS leaves a black grid on the pics. You think it could be nute burn? I don't have any burnt tips on any leaves on any plants though? On the very few leaves that are clawing and turning yellow there is like 1 very small rust spot. I'm using...

Thanks for the quick responses! @ mistaphuck I didn't switch over to 12/12 yet so I think it's a deficiency. @ Grizzdude so you think I should just add more Gro or Micro? Also on the plant that has it the worst I noticed the new shoot growing from the top is light green/yellowish unlike all the...

So I'm 3 1/2 weeks into veg. w/ clones from a local dispensary. I'm running Purple Kush in 6" Grodan rockwool's in an ebb and flow system w/ 40 gallon rez and 1000 watt HPS 3 ft. from the top of the canopy. I'm using RO water w/ GH 3 part mix at 3/4 strength, CalMag at 1 tsp. per gallon, and 1...

Got a tray full of PK clones from Harborside Oakland a week ago. I'll get some pics up as they start growing.

Good looking out on the link man! Do you seem to be able to breathe better after you toke?

Ain't no place like the Bay Area! Cost of living is a mothafucka though so it depends on your lifestyle. Only other place I would live in CA is San Diego, but I got love for the whole state.

Never bought any clones in SF, but Harborside in Oakland usually has a wide variety of strains available. All the clones I've bought from Harborside Oakland and Harborside San Jose have been successful grows.

Thanks for the info doc! I would be able to tell when the membranes are going out when the PPM's in the RO water go up I guess?

What if you have a water softener, but use an RO filter is that ok? I have a water softener and get 10-20 ppm out of the filter is this ok for my plants?