the very tips of the leaves are turning light green/yellow, why??

what are you growing in did you not add any perlite if not they prob cant breath and why do you have 3 in one pot you need to get thos in there own pot

No its just soil with lots of wood pieces and stones and so on, normal potting soil I have! I will pull them as soon as I know what's male and female! Its a VERY small space so I only have one pot

Read this man. You'll find what you're looking for.

https://www.icmag.com/ic/showthread.php?t=11688

I'd put my money on a pH imbalance or a magnesium deficiency, but I am no expert (yet lol).

Damn I don't like that..what will happen if I don't do anything about the ph?

Your plants will not be able to absorb/process nutrients. Therefore they will not grow well and will not produce the buds we all know and love. This condition is referred to as nutrient lockout.

To cure a pH imbalance, flush your soil with distilled water (2x the capacity of your container. So a 5 gal pot needs 10 gal of water) and get a cheapy pH meter. It's like 15 bucks at Home Depot. I bought a cheapy one though and it broke very easily, so be careful with it or get a high end one. If you check your pH after you flush (you may have to flush more than once) and it's not between 6.0-7.0, you need to amend your soil to get it in the optimal range. Best idea would be to go to a quality gardening store and get an organic soil mix, usually these mixes are pH balanced and light on nutes. Carefully remove your girls with a transplanting tool making sure to keep at least a little bit of a rootball intact, and place them in little peat moss pots (they're real cheap at walmart) with some of that straight organic soil mix. Amend your existing soil with the organic mix you purchased, water the fuck out of it, let it sit for about a week and then then test it again. Be sure to dump water on it everyday, just like you would if there was a plant in it. If you get it in that good range, put your ladies back in and continue. If not, put in more of the organic soil mix until you get it like you want.

Since you have potting mix already, it should be pH balanced; so just amend what you got with that.

If you don't want to do that, just get your girls out of the mix you have and make a new one, or just put them in new containers with a different soil mix (preferably organic).

If you check your pH and it's fine (between 6 and 7) you should check out that link i posed above, it's got everything you want to know about nutrients and diseas problems and how to solve them.

Here's also an awesome mix but you have to let it sit for a while: http://hightimes.com/grow/subcool/5728

That answer explains everything very simple!! Thank you!! The other thing is that I don't get ANY runoff at all, think the fan dries it out before in can run through or the soil is just keeping it in place..I'm thinking of buying perlite and making a new mix with some potting soil I have, just scared that I rip some of the roots when I transplant them?? I have never tried it so I'm not an expert and their roots are everywhere, I can see it because I have a see-through bucket I'm growing in. And I'm scared that if I flush it and the water doesn't run off they will be overwatered and die..

you cant leave them in a pot 2gether what are you gonna do when one is male you cant just chop that one down cuz then the roots will rot and kill the other ones and there gonna get tangled you wont be able to split them apart

All that evergreen bark in there releases tannic acid.