Growing first time Lowrider AK47 on Balcony

I have started 5 seeds on my balcony. I used a germinating kit with organic soil that I bought at Menards - it has a built in heating pad.

I have for the past 5 days put them under a Phillips 120W grow light. I would like to use better lights, but this is just really ancillary lighting as my balcony faces south and gets great sunlight - however the weather has been crap so no sun in last five days for more than a couple hours!

So I have left them under the light all day and night. They seem healthy, I am ready to transplant them now.

That is a big question for me - should I put each in an individual pot and if so how big?

These are dwarfs, and I do have a couple of very large planters I can use and put 3 in one and 2 in the other. The planters are 3 gallon each.

Are the planters big enough?

I will put photos in an album and see if I can put them here.