Help Please

Hello people,

im new here so just wanna say wassup to everybody reading this, like many on here i guess im a newbie first time grower, and i have some problems with my seedling, was hoping for some info if poss..

ok so my kit is... dr90 grow tent mk 2, 20 litre bucket, air pump attached to an airstone, and a submersible air pump also in the bucket, and a water pump with the hose going into the net pot (cut a small hole in the net pot) to feed the rockwool from underneath..have 2 65 watt cfl's hanging approx 3 inches from the top of seedlings, my seedlings are on there 17th day from sprouting...hope thats enough info, if not please ask, so my problem is as follows,

for the last 3/4 days iv seen increasing amounts of brown spots and also yellowing on only the first set of leaves (new ones are fine), only, i know first responses will be obv nutrient burn right, and yes iv had done loads of reading to discover if it could be this but no definitive answers.. i fed them 12ml of ionic hydro grow on day 10 and then another 5ml on day 12, is this really enough to cause burn, just for info i also i started them out with my 600w lumi dual spectrum in the shade and then decided to switch to cfls on day 6 from sprouting. I changed the water in the bucket but not sure if it was to late, roots are continuing to grow and look healthy, hence my confusion. also added guardian angel...

sorry for the long post,

any help much appreciated if you have the time

thanks

Under fed probably. I would get a ppm or ec pen and make sure you are feeding the right amounts because it sounds more like a nutrient deficiency than burn. I could be wrong but that's what the pen is for.

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When leaves yellow from the bottom up its usually a deficiency and spots are usually a calmag problem. Make sure you are putting calcium and magnesium in your water as well.


Oh also make sure your keeping around a 5.8 pH I believe for hydro or you could be locking out the nutrients so pH pen is another tool you will need.

Hope this helps

Hope this all helps

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Thanks mrblu for the input, iv got a ppm and ph pen, ph around 5.8 /6.00 and nutrient level is around 220, only thing is i dont know what the ppm was when i added the nutes as my truncheon broke and had 2 wait for a new one....