first of all, rinse the soil and read through this forum. you have fed it way too much, as well as watered them! plants should be watered no before than when top layer of siol gets dry and if you put your index finger cca. 3cm into the soil it should be little bit moist. don't fertilize until you get first white hair coming out of your plant. now wash the soil of all the unnecessary fertilizer and be careful with watering and feeding.
good luck in the future, let us know how are you doing
p.s. how strong light do you have? it's probably too close to plants also
this is old school horrible advice. Purple leafs can be from anything and rarly from fert burn. Typically purple leafs are from major temp swings, typically from really cold nights follows by hot days....or the grow room getting to cold when the ligths are off or just a cold room room in general as well as over watering. If it was nute burn it will show on the leafs but in a different way....rusting, yellowing, leafs randomly dying.
some1else if you use you watering tech you will end up over watering your plants as they do like to dry out.....typically its good practise to flood out your pots...we water every 3 or 4 days but that can be different for everyone...it depends on your situation. 3cm of pro mix will dry out in a day....but there will still be water in the bottom of the pot so to water them would be a bad idea....this leads to root rot, which can also make your leafs go purple. with regards to not ferting till the first white hair shows....what if you have clones? and thats besides the point....some strains take months to show sex.....typicall you should introduct fert a month after the seedling has popped or a month after the clone has rooted......
ps: a cfl can never be to close to the plants when your dealing with seedings.....dont give out bunk advise dude! I do agree with you that he is giving them to much fert though...but those mistakes will show up later in the forum of a dried up dead plant. IMO if you have been giving a baby that much fert this is a lost cause....if you have more seeds start it up again...only this time do your research!
stay safe guys!
Edited by Mrs. Lots, 08 May 2009 - 01:37 PM.