I have 4 plants in one 4x2 flood drain table and 4 in another with a thirty gallon res. I am growing intensely radioactive, purple haze in one 4x2 and shiva shanti, and blueberry skunk in the other. My grow room is 10 x 10 x 6. I keep the RH at around 50 % and temp around 70 to 85( just got a new room ac that has a air intake and out take that does not use the grow room air. got this to keep my climate more stable). My water is staying at 74 to 76 degrees. i am using the good old basic GH Flora (grow micro bloom). I started the one table with Purle Haze and Intens. Radio at a ppm of 600...Whoops i know.......now 4 weeks in i have them at around 500 ppm and a ph of 5.9. The other table has my skunk and shiva at 2 weeks with a ppm of 350 and ph of 5.9. As u see from my pics i have a problem with this type of burning. on my purple table i gave them a day of plain water to get the high ppm flushed out (once again that table is now at 500ppm). my younger table is having the same burning problem. So i am thinking maybe i didn't burn my earlier plants. I have my lights set at 8 inchs on the 4 week old plants and on the 10inch on the 2 week plants. I am using fulvic, and a dutch company root excelerator named Excelerator. I use 200 mil of the fulvic, and 30 mil of Excel. Please help..........

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perhaps i missed but what kind of lights are you using? maybe they are too close

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maybe just alittle to clone maybe put the light up to 30" or so

I am using a new wave T5, almost like a Tek-5. There is Four bulbs in it (two cool white, two warm) on my 4 week olds the light is 8 inch's off the plants and the 2 weeks are 10 inch's off the plants.

T5's don't get too hot and you can't really get them too close from what my hydro shop says. in fact, 8 and 10" sounds way too high.

I'd suspect nutes and PH.

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I have no idea on the lights you have there nevr used them or known anyone who has.The pictures look like light burn if you were using MH or hps but not sure if the lights your using can do that??

I would guess that you have fed them a high ppm solution and the feed has evaporated and left the salts in the medium, flushing was the right way to go, id keep going with that for a week maybe then come back to adding small amounts of nutes

doesn't look like light burn to me. You don't have any dark green leaves. Have you had darker green leaves at some point in your grow. 200ppm with a 30 gallon resevoir? you may want to check your math on that one. I'm not using your specific nutes but similair and it tells me 1/2 tsp/ gallon. for a 30 gallon res. thats 75mls.
I would agree with flushing for a day and then putting new solution in the resevoir. Since you do this every week anyway it should be easy. Get the dead leaves off your plants. They are not doing you any good anyway now and may be hurting the living part.

penguin is right on about the light you are using. put them right at the top of the plants.

so 6 to 8 inch's is not bad........also i talked to my hydo man and he said that i may need to up the amount of times i feed them. before i was feeding them 5 times a day for 15 min. the hydo man said up that up to every 2 hours. also my roots where trying up and not going into the tray around the net pot. i did do the full day flush a week ago and yesterday i changed the res. to 650ppm on the 4 week olds (225ml of grow, 150 ml mico, 75 ml bloom) on the 2 weeks (150 ml grow, 100 ml micro, 50 ml bloom) the ppm came to 500ppm........well after a little water transfer on both 20 gallon res. and now i have the timer set to feed 8 times a day now. also some more pics of grow room and plants. any knowledge for me is greatly apprec.

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