First Grow Question - Browning tips/yellow spots(pics included)

Hey guys, so this will be my first post on here hope you all can help me. But i recently purchased a pack of greenhouse femenized seeds, and i am growing great white shark and white rhino.I got them in 3 gallon pots with Foxfarm ocean forest mix

Im growing in an indoor closet that is probably 4x6 and 8 foot high, and the walls are coated in mylar. Im using a 400w hps bulb(all i got for this grow,until i get MH) with a hood.However the hood is not air cooled at the moment so it gets pretty hot when the light is on.I do not have a digital thermometer so im not sure what the real temp is but my regular one reads up to 90,and i have read thats max temp for weed. I have a oscilating fan running 24/7 pointed up at the light, and giving the plants a gentle breeze also. So far its about week 3 or 4 of veg in a 18/6 light schedule.

The problem im having is the tips of my leaves on my White Rhino are brown and dying and there is also some yellow spots on them. The great white shark isnt as bad but it also has some brown tips as well on 2 of its leaves. I haven't used any fertilizers yet, because it is my first grow.so I do not think its a nute burn(could be defeciency however).Also i have been watering my plants about once every 3 days, whenever the top 2-3 inches of the soil is dry i water until i see it coming out the bottom. I have my light about 34 inches away from plants because i think it may be a heat issue i did have the light closer. Id like the lastly state this could just be me freaking out cuz its my first grow, but i hope that isnt the case and there is a way to make my babys look better Any help would greatly be appreciated as im looking to maximize my grow <3

Excuse me if the pics are bad quality they were taking with my droid phone.

White Rhino Pic #1 http://i278.photobucket.com/albums/kk104/mbeach5041/2012-06-27_01-23-11_640.jpg
White Rhino Pic #2(bad leaf) http://i278.photobucket.com/albums/kk104/mbeach5041/2012-06-27_01-23-56_726.jpg
White Rhino Pic #3(2nd bad leaf) http://i278.photobucket.com/albums/kk104/mbeach5041/2012-06-27_01-23-34_576.jpg
Great White Shark Pic #1 - Only got the one pic, but some leaves have brown tips. http://i278.photobucket.com/albums/kk104/mbeach5041/2012-06-27_01-25-29_524.jpg

Might be that they're burning? I'd get some airflow asap and maybe raise your lights.

more airflow for sure, good advice from soverign ... how much water every 3 days???, remember wed/dry/wet/dry/wet/dry is what they like... dry all the way thru, feelin like a stick of cotton candy dry..

all pics show heat stress shows heat stress shows heatstress... woops im stoned... hahahahaah, "cupping" upwardsindicatin too hightemps.. i have a couple too summer temps are a bitch..

also re reading they could also be burning a little bit from the fox farms, theyll acclimate quickly tho, no worries plain water for the next 2 weeks at least

SFguy said:

more airflow for sure, good advice from soverign ... how much water every 3 days???, remember wed/dry/wet/dry/wet/dry is what they like... dry all the way thru, feelin like a stick of cotton candy dry..

all pics show heat stress shows heat stress shows heatstress... woops im stoned... hahahahaah, "cupping" upwardsindicatin too hightemps.. i have a couple too summer temps are a bitch..

Click to expand...

Hey thanks for replying all, ive been giving them bout a .5 L of water every time i water. Ill try raising my lights more even tho they r at 3 feet about already. Also i do not have another oscilating fan that i can put in there , is it ok to put just a regular stand up fan in there?

Try leaving the door open if possible until you figure out a way to suck some heat out. Extra light won't hurt in veg. I veg 24/7.

Jonny K said:

Try leaving the door open if possible until you figure out a way to suck some heat out. Extra light won't hurt in veg. I veg 24/7.

Click to expand...

hey johnny thanks for the reply, does leaving the door open during dark time matter too? i do not go in there to manually to turn off my light, i have it on a timer so the door would still be left open during the 6 hours of dark and might get light in it, that wont matter during veg?

degz said:

hey johnny thanks for the reply, does leaving the door open during dark time matter too? i do not go in there to manually to turn off my light, i have it on a timer so the door would still be left open during the 6 hours of dark and might get light in it, that wont matter during veg?

Click to expand...

correct, the most important thin is to keep them stable while flowering, no light leaks... in veg.. there resilient, lil bitches and will/ can take almost anything u can throw at them... but remember theyre bitches they dont need ALOT of love... lol

alright, thanks SFguy. I checked them out today and the leaves on the white rhino r really scaring me, so dry and brittle! i hope they bounce back. i got the door open and also raised to light to bout 4 feet away.

maybe moisten/ mist them with some water or your temps are just outta controll and you need to shut it down untill sept/october when it cools off or get and exaust fan

You should water more then every 3 days and i would try just a little bit of nutrients, i usually water every day and fertilize every other day

SFguy said:

maybe moisten/ mist them with some water or your temps are just outta controll and you need to shut it down untill sept/october when it cools off or get and exaust fan

Click to expand...

I do not want to shut it down because my plants will die . Ive read misting them with water is bad because once it evaporates it leaves hot spots. if thats not true, i will try that.

adding a picture of my grow room(closet) to see what im working with. i raised the light a lot and gonna try keeping the door open. with the new way i got it set up it is way cooler in there.
http://i278.photobucket.com/albums/kk104/mbeach5041/2012-06-27_19-57-57_304.jpg

there is bout a extra foot on each side.

You can mist them just before the lights go out and no hot spots Do not water every day unless you don't like your plants. Definitely do not fertilize every other day. Thats just stupid.

Jonny K said:

You can mist them just before the lights go out and no hot spots Do not water every day unless you don't like your plants. Definitely do not fertilize every other day. Thats just stupid.

Click to expand...

Ok cool thanjs jonny, but yea i wasnt gonna water ever day or give them ferts i know thats bad lol dk what that guy was talking about

i think you need to get a temp gauge, i dunno why its sooo hot in there bro my 400 is waaaay closer in a much smaller space

so far with the door open they havent gotten any worse so i guess thats a good thing
i also have a fem. greenhouse pure kush im growing too, thats only bout a day behind but is waaay smaller lol, but no burnt tips.

the sharpie is for scale reference:
http://i278.photobucket.com/albums/kk104/mbeach5041/2012-06-28_18-54-09_935.jpg

Could be airflow, light positioning or lack of moist our to leaves, Air more with a fan possibly, move light up away from the plant more and moisten the leaves none of these could do harm and if it solves the problem great

Cannbosh said:

Could be airflow, light positioning or lack of moist our to leaves, Air more with a fan possibly, move light up away from the plant more and moisten the leaves none of these could do harm and if it solves the problem great

Click to expand...

thx for reply cannbosh. and yea i've moved my light up, and added a box fan to one side that ill be runnin 24/7.also im keeping my door open to exhaust some heat. and im gonna try and mist them right before light before the light goes off.

i would love to help but clicking on links takes too much time from masturbating so can you learn how to post pix then i'll come back???