Older leaves yellow at tips/When should I re-pot?

i have four skunk #1 plants that are currently 5 inches tall, growing under a 400w mh bulb in my closet, batwing reflector, walls painted white, intake cool bedroom air from under the door via small duct system and driven by kiddie fan. the temp is around 77F. anyway, there are a few leaves that are a little yellow at the tips. the new growth is great, and they seem to be coming along pretty well otherwise, but... the yellow. how do i fix it? also, should i re-pot asap, judging from the size of the plants and the distance between them in the pics? or can i wait a bit longer, so they'll be stronger for the re-potting? thanks for any advice!

also. the one in the back in pic 5 and the same one in the top left in pic 6 has kind of deformed 1st leaves (the ones after the cotyldons) and the cotyldons on all of them are kind of shriveled and drying out a bit. is that to be expected? or is it bad? the soil is still moist. i gave them their second drenching of plain water a few days ago, after i allowed the soil to dry out enough after the first watering.

did you give them any ferts?

not yet. someone told me that i should wait about three weeks, and it's coming up on that now.

Are you gonna leave 'em in the same pots? I'd re-pot 'em.... and give 'em some VERY light FULL spectrum nutes

L

I would get them in individual pots ASAP. you should start them in their own pots next time...less hassle. I would put them in bigger pots by themselfs, give them a good watering and let the soil dry out. Then repeat. Start introducing nutes in a few weeks..

Be carefull of the roots when replanting, they may be bkigger than you think.

be carefull of those roooots and def bigger pot hopefully the roots havent crossed yet