Seedlings, how do I treat them?

[sylvestris]

Hi guys!

I've built my own Aerospring type system and now I'm waiting for my water pump to arrive. It's still caught in the mail somewhere. I've already started to get sprouting chilies, spinach and tomatoes so I am a bit stressed they will grow too big and need more room before i get my pump and can put the seedlings in my system.

Is there any way of "storing" the little ones while I wait for the pump to arrive?
I don't want to damage or inhibit the seedlings in any way.

Will repotting them into LECA and net pots work? then watering the whole lot a few times per day?

Should i keep them under light?