My plants are about two weeks old now and they are starting to yellow a little bit, and I also have one thats not acting like its wanting to grow very well. I was wanting to wait two more days before I put them in the Hydroponic system and started feeding them. They were doing great until I transfered them to the rockwool. Now as the new lwaves come in the have a bit of a yellow tint to them. Please check out the pics and let me know what do I need to do?

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Hmmmm....could be a lot of things at this juncture. What's your pH in the cubes? What process did you use to ready the RW? What kind of lights are you using at this stage? How about heat / ventalation? These details might help diagnose....

MMmm....what soil did you use? did it have slow release fert in the soil? if so have you been feeding them aswell? and how often are you watering?
Looks to me as if its nute burn or over watering?
Just my opinion mate.
id not water them for 2-3 days.
The same kinda thing happened to me and it was due to over watering

Hope they turn for the best for you.

My pH is about 5.6 im using the General Hydroponics test kit with the GH up and down. I started them in a 6 pack starter plug medium suggested to me by the guys at HTG Supply. Im using the HTG Supply T5HO 4ft. Fluorescents with two blue spectrum grow bulbs in each of the 2 ballast. I am currently running them 24hrs per day. Heat stays around 70 - 74 degrees. Ventilation is simply an 18" Oscillating fan (there's only 4 plants so I didnt really see a huge need in a big expensive ventilation system) I let the plants germinate in the 6 station starter plug medium for about a week and a half before transferring them into the rock wool that had been soaking in a pH of 5.5 for about a day and a half. This was two days ago.

Its very possible that I am over-watering. Ive been watering once a day everyday. Im not using any soil and I have not fed them ANY nutrients. I simply Put the seeds in the starter plugs and watered them. They were looking GREAT until I put them in the rock wool now they're starting to yellow.

Slightly overwatered for those temeratures.

How close are the lights? It looks like they don't like something about the spectrum.

the lights are six to eight inches above the plants.

Try dropping the lights down about and inch or two, with your fan heat will not be an issue.

Weak light can cause yellowing, but yours are not stretching which is weird, normally when the light is defficient the seedlings stretch and fall over.

A real weak dose of nutrients will not hurt them at this stage, like 1/10 strength.

Keep in mind they are not in the Hydroponic system yet, would mixing the nutes and pouring them over the rock wool hurt them?

2 weeks and they need to be fed. Young ones don't need food for 2 weeks, It's time. Do not mix and just pour over them. They need 1/4 to 1/2 nutes now and be put in the system to keep from over watering. Actually there is not such thing a overwatering or there would be no hydro. The thing is not to let the rootball stay wet all the time. That is why we time our drips and floods. NFT never drowns the rootball, The roots hanging down are water roots and can stay deep in the water. The rootball needs several hours of good air each day to stay healthy. That's why DWC and bubblers works so well, they never soak the rootball.

Get them in a system and the just the top of the rockwool will dry out some and be fine. Your girls will be just fine when they get some nitrogen. Good luck and keep us up on how you did.

OH, what kind of system you got ?

The GH feed chart calls for 1.5ml of Gro, Micro, and Bloom for the "seedling phase". Is that already cut to half or am I supposed to do half of that?

I am using a 5 gallon bucket, drop-in net pot, hydroton, rockwool starter cubes, and an airpump / airstone with GH nutes. (I forget what the technical term for that system is.)
(This is a "DRAIN TO WASTE PROGRAM" (according to the GH feed chart) though right?)
Also real quick, my buckets are from Home Depot and they are orange, should I paint them black to prevent light from getting in?
And how much water should I put in them (I.E. How far should the bottom of the net cup be in the water)?

When I ran hydro the top of my netted pots where 1.5" above the water line, most of the roots stayed wet all the time. The exposed roots were able to supply enough oxygen.

I always start much weaker with the nutes and build up to full strength over a few week period. You can always tweak up your nutes but you cannot take it down real easy if overdone.

...

So are you saying that I should start weaker than 1.5ml per gallon. Thats what the General Hydroponics feed chart suggests for seedlings. If so, how much would you suggest?

I would go with 1.5 (maybe even 1.25) each of the FloraGro, Micro, and bloom instead of the recommended 2.5 the first time. Like mentioned above, if you give too much you can't take it out, but if you get a little less and it needs more, then all you have to do is add a bit more.

This is the chart your going by I'm assuming too correct?

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Yeah thats it. Well theres two, the one you have there is the "Recirculating Program". There is another called the "Drain To Waste Program" It suggests to use 1.5ml for seedlings. This is the system Im assuming that I have.

Sounds like just DWC (deep water culture) or bubbler. The others sound like they have you on the nutes, just start light you can always add more.

As for your netpots and buckets. The water level should be just barely below the bottom of the netpots. The idea is for the bubbles to come up and pop at the surface and splash the netpot a bit. Once roots have grown into the water the level can be dropped alitlle as it is less critical. You are coaching the roots down into the water. If they look like they are drying up before the roots hit the water then you can just pour a litle water over the top much like a drip system again to coach the roots to the water.

Those orange buckets should be fine if you do not see any green algea in them. Or you can hold one up to the light real close and see if you can see light through it. If your light is real strong like MH or HPS then you may want to paint them black.

OK! Plants are in the system, nutes are in the water, lights are set to 18hrs. LETS CROSS OUR FINGERS and see what happens!
Thanks for all the help so far guys! Im sure this wont be the last of my questions!
. . . CHECK OUT THE PICS AND LET ME KNOW WHAT YOU THINK!

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Looks good. What kind of light are you going to step up to ?

Cause you got the room to veg alot.

Right now Im just sticking with the 4 plants and the T5 HO Florescent bulbs. Ive got the blue spectrum bulbs in the now for the veg stage and I have some red spectrum bulbs for the flower stage. I do have plenty of room for more and even a whole other closet Identical to that one that I can set up for a flowering room, but this being my first time, my plan is simply to practice with these guys, get it down pat, and then MAYBE build up from there.
And as far as answering your question about the what I would like to move up to, I really dont know. I'd certainly be open to suggestions if I decide to go that route!

No need to add more plants, it's just your spacing is very good for growth. I might top them out and put a 600 or 1000 HPS just for flower but I'm a little over kill and heat will be a problem you have to learn from.

You are absolutely right. Learn your room and get a few grows under your belt. That is what they had me do. Don't top or anything. Veg to about 12 to 16 inches and flower. The fewer the pieces to the puzzle, the easier to fix problems.

Keep us up with pic's.

Oh the other space could be veg room and mother room. Then you got a Sea Of Green. Now there's some work.

Looks real good, and you are definately following rule number one: K.I.S.S. Your setup is very similar to mine. You may want to flower even as low as 9 inches, depending on how many nodes you have showing. Your fluros aren't going to get much penetration...heehee...that word always makes me giggle.... Looks good so far!

UGH! OK... Today (monday) is the third day since they've been in the systems and the 18hr light cycle has started! Two of the girls look GREAT! But two of the others aren't looking so hot! They seem to have gotten a little yellower and one of them is even starting to brown ever so slightly along the edges of a few leaves. I just added more nutes to the mix and got a spray bottle to mist the leaves and such. If anybody has any other suggestions please let me know! Thanks guys!

Those are DWC. Are the roots getting enough water ?
You may need to hand water a bit to keep the the roots from drying and help them look for water below. That's why we like the drip system, you can cut the drip altogether once the roots hit the water good.

What kind of water are you using ?

Listen to Loc he has you on the right track!! and I cant resist and forgot the name who asked but ....... "what kind of soil are you using??" In Hydro??? LOL

OK...Sorry I havent checked in in a while. My internet was down. Just changed out the nutes today (friday) two of the girls are big and beautiful and on the right track to greatness! I had to go ahead and get rid of the other two. They were very yellow and wilted so I figured it be best just to focus on the two that were doing good. I think that maybe these were just some bad seeds. ALL of them were treated exactly the same and these girls just weren't making it.