Tip of Seedlings First leaf turning yellow. And questions. HELP ME PLEASE.

Ok So the first leaves of my 6 day old seedling is turning yellow Just the very tip of the leaf tho. Now I checked the ph of my tap water which I have been using to water my plants and it was around 7.5 Now could ph be causing this effect this early in growth? Now I got some distilled water that is ph'ed around 6.0. I added some tap water to the distilled water and got a ph of 6.5. Does this mean now the water is fine? Adding tap water to distilled water wouldn't hurt the plants when i water right? The PH is balanced that way.

I have 2 plants by the way both are in keg cups under 78 watts of 6500k spectrum CFL lights.

Second The plant has stopped growing completely. Why is this? now the other plant is fine no problems yet.

Here is a picture. Look at the leaf on the right you see the yellow tip.

Questions to be answered.

1. Mixing distilled water with tap water to get a balanced Ph is ok right?
2. Do you think Ph is the problem with my seedling?
3. Why did the plant stop growing?
4. At 6 days I already have a root coming out the bottom of my keg cup is this okay? Its a long root about 2 inches just hanging out the bottom.

Here's a Pic of the second plant.

The short answer is that there isn't much inherently wrong with mixing the distilled with the tap water, water from the tap even provides trace minerals. The tap water itself there might be a problem with, however. It really depends on your growing style and locale. From location to location tap water contains different amounts of different elements. Tap water from anywhere virtually always contains chlorine and/or chloramine. This keeps bacteria from growing until the water comes out of your tap, but it also kills any beneficial microorganisms in the soil. Regular chlorine can be boiled/bubbled out but the chloramine is more stable and can only be removed using a reverse osmosis water filtration system, or partially removed with a carbon filter like a Brita tap filter. Depending on the amounts of these things in the water and whether or not you care about the microorganisms, the plants can be watered consistently with just chlorinated tap water and they will still grow.
Then there is fluoride, which I am pretty sure is more toxic to the plants. A carbon filter wont really remove it but a reverse osmosis filter could. If the tap water in your area contains fluoride you might want to think twice about using it to water the plants with.

Your seedlings might be fine though, I noticed some yellowing like that on my seedlings and came here worried about it too. They are still quite young and the cotyledons should still be nourishing them... try watering them with distilled water only (when they need it) and see how it goes.

Thnx for the response. But I am worried because i lost my last grow within 2 weeks the leafs turned completely yellow and it was cause the tap water so I refuse to use it. But the ph of the distilled water is 6.0 That's not good right? Why should i leave it unbalanced? And that pic was from yesterday its gotten worse its more noticeable now.

6.0 is alright...once you start mixing in nutrients it will drive that even lower, and even then some people are going to tell you that you don't need pH Up if you're growing in soil.
It looks like you're growing in soil or a soil-less mix to me, in one of those pictures it even looks like there is some coir in the mix. Let us know what you are growing in though, the bag should tell you the ingredients. For instance, it likely contains dolomite lime (especially if sphagnum-based) and this is what helps balance the pH.
Water with just the distilled water and then check the pH of the run-off to see if its any higher when it comes out still. Bottled spring water should also have a higher pH I think.
Definitely check if your tap water has fluoride, I don't know what effect it has on seedlings but I am pretty sure that they aren't supposed to stop growing or die for no reason when properly cared for...even if the pH is a little high.

Oh yes, also ensure that your soil isn't already loaded with fertilizer. This could certainly kill them, but you should notice that the leaves has burnt and shriveled up.

Thnx Again. I am actually growing in a soil-less Medium. A mixture of coco,verm,perlite, and some oyster powder Don't know why i added that but i did. Even tho I am a new grower I wouldn't use a soil that contains any nutes or ferts. Because of that fact that I am new And I am trying to learn this plant at the easiest possible way first before I step up. I think using coco was a mistake already lol. I checked the Ph of the runoff once already It was more around 7.0 I believe But I think it was actually 6.8-6.6 cause the runoff was brown and I am using a fish tank Ph tester so I need a certain amount of water to test and the brown kinda made it darker so I am guessing if I didn't have the brownish water the color would Have been diff.

And When should I actually water? When the top inch is dry or top 3 inches? I have been hearing both. Now as for the other plants I killed them they were looking horrible I would show you pics If you wanted to see but they only lasted a week and a half or so. But yea no ferts or anything in my medium yet so its all clean just the mix thats in there.

The oyster shell powder is comprised of calcium carbonate. It is almost like dolomite lime, which is calcium magnesium carbonate. They fit the same purpose; raising pH, as well as providing calcium and also magnesium in the case of dolomite lime. Oyster shell is available in a more coarse form that would break down over time, don't know which variety you used.
The thing is, neither oyster shell or dolomite is necessary in your medium because coir is already near neutral pH-wise and especially considering that you don't have any fertilizers which are typically acidic and would drive the pH down. Therefore your pH is going to stay a little high. How high/for how long really depends on the type and amount of oyster shell you added. Knowing this I would definitely water with distilled only, maybe even begin adding minute amounts of acidic fertilizer or supplements because you want your pH to drop a bit. As the plant grows and starts pulling nutrients from the soil the pH will rise.
Coco coir is a nice medium; it is airy, absorbent and well draining. Due to its characteristics it is a bit more difficult to over water. That said, I have read claims that watering once a day is fine with coco, or go for every other day...just don't let the pot sit sit submerged in water.

Thnx. But now they just look so bad like that don't look happy at all I got the lights 4 inches from the plants. And there still look stretched out at least one does the other stop growing. I just wanna keep the plants short and stocky. and healthy and green but mine are looking quite unhealthy. I just don't get it.

Nullis What does this look like to you. Now these are 2 different plants that are both dying slowly I think And I am still not sure why. Notice the leafs in the picture First the end turns a darkish brown like shown in picture #1 at the tip of the leaf then turns yellow. What is this??? And Can you gimme some steps to take to fix this. I will keep you updated.

They look a little dry but i can't really tell from the image. They don't look as if they are wilting from lack of light. It almost looks like it got burned.
Are these the same plants as the first pictures?

Also, what specific brands of coco coir, perlite and vermiculite are you using? Perlite such as the Miracle Grow kind comes with fertilizer but I don't know how much. Most coir comes pre-rinsed and/or is harvested further inland, but some have higher levels of salt.

I use Black Gold seedling mix, Sunshine soil-less is basically the same thing but I haven't used that for starting seeds. With decent seeds, constant warmer temperatures and moisture they should do good on their own for a couple weeks.

I mean I ask people how far I should put my cfls away they say 3 to 4 inches so that's what I did I dont see how it could have burned them. Now I am using coco from the pet store just spome regular old coco that you would by for bedding for lizards and stuff It comes in bricks. I use it for mushrooms mostly. Now the perlite is Schultz and verm is Sta-green Its all natural no Mg or anything

Do you Have a grow your self Nullis?

The lighting probably wasn't the cause. If you're using the ZooMed Eco-Earth I am familiar with the brand, I've used it before but I always rinsed it quite thoroughly. It might still contain salt, which is essentially table salt (NaCl) just not as refined.
I've read that sodium (Na) will be taken up by the plant before anything else and will cause vascular damage. Excess chlorine will also cause leaf burns.

If you've used this same mix with these products before and keep getting this same result you should definitely either rinse the hell out of the coir or find yourself a good seedling mix.

Your right I got me some Scotts potting soil It contains N.P.K of 0.07-0.01-0.03 I think that's the N.P.K. I am going to start another grow with this and see what happens. But do you have a grow nullis?

I have some Big Bang that should be ready to cut within a few days, it's been in flower 8 weeks under a 250 watt HPS. Next up is S.A.G.E (T.H. Seeds), Amnesia Lemon (Barneys Farm), Rocklock (DNA) and Cole Train (Reserva). They're about two weeks old now. The BB isn't at full potential but the final product shouldn't be too bad at all. I need to resolve an on going gnat problem and make sure I am extra-well ventilated, just need a bigger light with a digital ballast and an air conditioner.

If possible try to keep your seedlings in a dome. Certain plastic fast food containers with the dark bottom and transparent lids can fit this purpose, as can some kinds of produce containers like the kind spinach and lettuce might come in (as long as it doesn't have too many holes). It helps if they're in an enclosed, humid environment for at least the first week or two.

I really need to make a small cabinet. Will this potting soil be okay tho? The scotts potting soil. Should I mix it with anything. I also ordered some Blue Cheese From barneys farm and Got the free Rocklock. And I want to prepair for this grow this is kinda why I am doing the one I got now. I can almost bet once this bagseed germinates And I put it in soil it will do better then the COCO. Ive grown before outdoors in soil and everything went perfect despite the fact that they where males it still went great. I think it might be the Mix I have causing these problems.

My friends! i have the exact same prolem lol uffff and i am changing mine to coco soil, kos these nasty bugs are in my soils. and yes mine is yellow ish too! oh my god what is wrong with our babies??? HELP me too please