The stump was the first plant, started outdoors 2 months ago, a purple something strain, that died from nute burn when brought indoors.

How should I transplant the seedlings the best way possible?

Also, as you can see I prolly do not have room for any more pots, other than maybe a small 2-3 inch diameter, but I wouldn't have the space to transplant later anyway...

So should I put a few in the other pot already in the grow bucket, since it has only one seedling so far:

Then raise 4 or 5 seedlings per pot for a few weeks, then decide which to keep, and leave 2 plants per pot?