If it were me I'd wait 6-8 more days. By then they'll have their first set of real leaves. Let the soil dry up and then transplant them. You don't want them in those cups very long.
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Seedlings lookin good Crimson. Make sure you get a bag of gravel or river rock so you can put some in the bottoms of the 5-gal's for drainage. I also think perlite would make a good addition to any soil mix you plan to transplant into. Maybe mix some sand in too. What kind of hid were you lookin at?
They're looking happy, keep it up. In small cups like that I went 3-4 days without watering. I added perlite to my final soil mix and recommend it for you. I water every 4 days now in their perm homes. If I hadn't done it I would be waiting much longer than that for the soil to dry. You can definetly control the height of your plants based on how far the lights are from them. I did on my grow and it took past their 4th set of leaves to break 2 inches in height. I've LST'ed them and now they're bushes. Just letting ya know what I've been able to do w/ CFL's.
Yeah, they look like they are choking in that soil, I would definitely mix in a fair amount of perlite when you transplant.
awesome, i see online it comes in 1qt bags (.25 gal), do you think 1qt will be enough per 5 gal bucket?You can get perlite at Lowes or Home Depot. If by chance they do not have it at your local store, stop by any greenhouse/nursery and they'll have it.