Advice on yellowing seedlings?

hey these are my babies, yellowing at the tips of the leaves and stems seem weak for how big they are, about 5 inches tall under a 600w hps, mixed 50/50 happy frog and ff light warrior. any advice on any thing to help me grow better and more efficient is appreciated! =)

If you can take a pic without the lights on, We will be able to see the yellowing better, Being as small as they are they should not need any nutrients or very little, So maybe over watering is just a guess, 600 watt HPS is kind of big for those little ladies but if it is the right distance away they should be ok, MH. works for Veggy state the best or T5s also are nice, I at one time used a 150 watt Hps for my veggy growth it worked fine. more info on what your using too may help more kind folks out here to help you out , Good luck hope everything gets better.

thanks so much for your input, i am switching to 600w mh today in about an hour, and i will take a pic with the lights off and post em up. unfortunatly my humidity is at about 30% i need to up i just need a humidifier, my stems seem a lil thin any ideas on how to strengthen those bad boys up?

Drizzle1994 said:

thanks so much for your input, i am switching to 600w mh today in about an hour, and i will take a pic with the lights off and post em up. unfortunatly my humidity is at about 30% i need to up i just need a humidifier, my stems seem a lil thin any ideas on how to strengthen those bad boys up?

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Use a small fan to promote strong stems or you can just tap them a few times a day I also have a 600w mh and my humidity is about 30% I have been using a spray bottle to keep it up but mine are all healthy 6 days old could be nute burn but unlikely with that mix how close is that lamp? Like said above turn that hps out

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the 600w mh is about 2 feet from my canopy, with my new 450cfm inline fan the temp is a steady 70 F, is this temp dangerously low for my babies?

Drizzle1994 said:

the 600w mh is about 2 feet from my canopy, with my new 450cfm inline fan the temp is a steady 70 F, is this temp dangerously low for my babies?

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My nursery tent is running at around 72 and they're doing quite well for as cold as it is in general. Course I have a heat mat that comes on for the 6 hours of lights out.

Looks like a little heat stress the way the edges of your leaves are starting to roll in

great idea ill throw my heat mat under there so the temp doesnt drop, im on 24 hr light cyle, can i switch that to 18/6 or will it stress my babies out? and yah i had my 600w mh light on with no fan and they were burning up, i feel like i might be taking to much air out of my tent but only time will telll, if the very tips of my leaves are a brownish yellow, is that nute defic? or is that also from the heat stress

and about how much water should i be gving my lil beauties?

Drizzle1994 said:

and about how much water should i be gving my lil beauties?

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There's not a definite amount anyone can tell you because everybody's environment is different temp, humidity, lighting, plant size, mediums, pot size, and so on. I find the best way to know is to water your pot well, pick it up to feel the weight, then fill a container with dry soil and check the difference in weight. Water a little before it gets as lite as the dry pot. Watering properly is one of the most important part of growing. New growers almost always over water and it causes a shit load of problems and about 300 threads a day because of it.

UPDATE. here are pictures of my full set up, the dimensions of the tent are Length 8ft, width 4 ft, and height 7ft, i am using the 600w mh light with a 400cfm fan attached to suck hot air off the bulb and through the ducting, out the top of the tent, i have an oscillating fan set to low blowing over my canopy, the passive intake on the bottom of the tent is open right by the oscillating fan. my light is precisely 30 inches over my canopy, how close should the light be? and i am noticing one of my plants soil drys up before the other two, is this one receiving more light than the others? how much space am i covering with my 600w mh? the pots i am using are approximately 8 inches tall and there is a picture of my hand next to it for comparison, if anyone knows how big these pots are please let me know because i am trying to figure out precisely how much i need to water and when i need to water, my temperature is fluctuating around 75-82 degrees F. my Humidity is at 20%. also if anyone here has any experience, when is the earliest i should top?

Drizzle everything Look really good so your well on your way, as for watering only you can tell how much you ladies are using, Mine vary all the time, the best way is to lift your Plants and don't over water when there light you will know to water and don't give to much at this time just enough to put some weight in the pot, and for topping you should wait for the third Node well that's what I do and its been working for a long time now. My temps are down in the lo 70s and 60s at night they seem to love the cooler night in the winter here summer it runs in the 80s and my grow does not do as well so I run my AC all summer to keep it in the lo 70s. everyone is different so I hope that helps you a bit . as your pics look good. Watch the Heat too you will notice the leaves curling on them they may be getting a bit to hot. Keep up the good work,

Did you try your inline fan on the side of the small white fan? I will be setting mine to pull air through a carbon filter (both filter and inline fan on the left side of light) and push the air through the light fixture and out of my tent. Seedlings look very healthy though.

thankyou guys so much i will be posting an update shortly things are lookin great