help yellow leaves

Hi there have done a few grows in the past but dont remember having this problem
got 4 plants on the go they are
2x hindu kush
1x ak47
1x skunk berry
they are all auto flowers and are all 4wks old.there in plagron light mix soil and are watered everyday but when i say everyday i only give them a little bit of water just so the top of the soil is dry , when i check them the nxt day soil is completly dry they have had 1ml of plagron bloom to a liter of water the last 2 wks
dont know what the ph of the water is but every drop i give them is filtered and left to stand for 24hrs before feedin
lights are 1x 125w cfl grow bulb and 2x 23w smaller cfls on the side for side lighting
can any one out there help me pls will upload pics later tonight

Well CFLs don't put out a lot of heat, but do you have a fan in there blowing on the plants? Because if you have no fan, and you use CFLs and you are watering a little everyday then you are overwatering. CFLs don't make enough heat to dry soil in a timely manner...
The best water schedule for MJ allows for the plant to become totally dry and then get totally soaked, and then totally dry again before you soak it through again...Watering a little everyday keeps the roots from having to grow to find the moisture...so you end up with not enough roots for the amount of leaves you have...so again I say you are overwatering...water thoroughly maybe once a week with the set up you have there...

Thanks for the reply i have 2 pc fans in there one bringing consatnt fresh air in and another taking the hot air out cfls are about 2 inches from the tops of the plants very small area so the heat does tend to build up with in the growing area the fans are on 24/7 and 2 of them are in 11liter pots while the other 2 are only in 5liter pots (i think there 5 liter) yellowing started at the bottom and is on first set of 3 fingured leaves

can anyone tell from the picks if it is overwatered ?

Anyone ???

just clip off the yellow leaves if they bother you, if the plant stops growing or the yellow gets worse and worse you might really have a problem

Ok thanks will do that is it overwatering tho or is it a problem

It looks like the yellowing might be moving up the plants so i think ive got a problem does anyone know what causes this?

I have just noticed that where i leave the filtered water in the grow area to water them when they need it in bottle i uswd it looks like green algee at the bottom of the bottle could this be the cause of the yellowin leaves doesnt look like they have grown much either lately anyone pls help me ?

That looks like either nute burn or a lack of nutes. Hard to tell since I am looking at a pic and not familiar with the nutes you are using. As for watering you want the soak the soil until water runs out the bottom then let the soil dry out, when the to 1-2 inches of soil is dry water again.

When this started accuring i was only feeding 1ml of plagron bloom to a liter of water dunno of that helps

The yellowing has just started on the tips of the first set of 5 fingured leaves if that helps if u need to see anymore pics than just let me know and ill put some up

thought i would add a couple more pics to try and get this solved thanks guys

watering everyday is the problem. the roots never get to breathe

Ive stopped that now and water every 3-4 days when the soil is bone dry and the problem is still carrying on