Quote Originally Posted by bioguy
I have a 4 x 8 tray with several strains in it. One plant has very bad leaf curl and the rest are fine (even the others that are the same strain).

System:
1000 watt hps (bulbs need replaced) air cooled (can touch the glass cover)
Botanicare Nutrients (PBP B, Liquid K, CalMag, Aqua shield, dash hydroplex)
PPM 1500 ph 5.8 (PPM up from 1350 this res change...yesterday)
Used ZHO and Voodoo at start
Temps and Humidity stable using Sentinel EVC2 (68-88 and less than 55%)
1 gallon smart pots with rockwool croutons. The pots are moist.
Flood once daily
lots of circulation fans
CO2 on a timer

It only effects the top leaves so I thought maybe they are too close to the light but the lights are cool and some leaves 24 inches away are doing it and others 18 inches away are not. The other plants off this strain are in the same tray but under a different light (that is shot...will be replaced this week) so maybe they would be doing it to if they were receiving more light?
Most unusual is it just one plant. You can see healthy leaves in the background

The only thing that has happened in the last 48 hours that was unusual was 1) I opened the door in the dark cycle (2 hours after lights went off) for 5 seconds 2 days ago and 2) The flood pump was disconnected and they missed a day of watering 1 day ago (got water last night) which meant they got an extra flood. But once again all these plants have the EXACT same treatment.

Any Ideas...crazy or otherwise...would be great.
My plan is to do nothing and think positive. I think its an underestimated technique.:thumbsup:
ahh bro had the same deal, i blamed silica blast for its ph issues. though, im thinking because your pump went out you might have had some root damage which caused your problems. light issues as well as light/dark cycles are not your problem. many ? come to mind. are those affected, near the inlet for your nutes? you also said some others were affected but not as bad then you said again that it was the only one(little confused here,your pic suggests that more than one)? then you gave them an extra feeding which could be more of a problem and with all thats been written, i would say you have more problems to come. get some clearex and flush...most likely youll lose the worst of the lot. mistakes can make the biggest differences so do your best to prevent them, though it does happen. if your new to this, consider soil...fox farms is good to start with. im still going with root dehydration, once a day for that size of plants isnt enough in my opinion. then losing your pump for a day makes things worse, not to mention the double feeding. hope this helps.