day 20 from seed....all looking good except from one....yes....unfortunately one plant seems to be sick....at the tips of the first set of leaves, not the round ones, i can see brown colour....what is this? already i have fed all of them 2 days ago for the first time with nuts less than half strength...anyway next watering is scheduled for sunday....i think is best to drain the buckets a bit....i have already started enriching the air with CO2....i found a guide of how to grow maryjane from NIRVANA at: http://www.cannabis-seeds.cc/guides/...wing_Guide.pdf which describes a very cheap and efficient way to provide CO2 at the plants.....the one with urine and sugar......anyways....what's with the brown colouration on the tips? is it nuts burn? why it has appeared only in one of the nine? (thank god).....