Panta, Id transfer them into at least a gallon pot. I transfered mine yesterday and the only weak one that i threw out had a fat root on it that was probably touchin the bottom of the cup, so i know my other plant's roots were growing alot faster then i thought. And plus your plant looks at least 4 days ahead of mine so they're for sure gettin too big for that temperary pot. It also might be needing some nutrients, but only a very small amount. I put a little worm castings and some bat guano on the top of my new soil and watered it. I just checked em out and they're not doin too bad, i was expecting some decrease in health/appearence from the transfer and at the same time their first nute feeding, but they should come back twice as strong in a couple days, ill keep you posted